Dual Walbros: Let Me Know What You Think

[tscook3]

Well today I took some pics of what I rigged up yesterday for the talon:

Dual Walbros In-Tank

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BUT,

Think I will be re-doing the wiring. Did a little thinking today and think it would be best to run the wires for the pumps out the sending unit to two seperate relays. Right now the connections are doubled up and I was just going to use one relay with a large feed.

Let me know what you guys think.

 

[1fastlaser]

Well today I took some pics of what I rigged up yesterday for the talon:

Dual Walbros In-Tank

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BUT,

Think I will be re-doing the wiring. Did a little thinking today and think it would be best to run the wires for the pumps out the sending unit to two seperate relays. Right now the connections are doubled up and I was just going to use one relay with a large feed.

Let me know what you guys think.

Looks good man! Wasnt hard was it? Now I got a question for you . Is that a big vacuum Y you got there? Very good Idea.

I just dynoed my car on pump gas with this setup. One 40amp relay with the wiring how I told you, and made 561 on 26psi, and went for 30, but aem hit the boost cut I forgot to raise. But at 6500 I was already at 580!

Figure thats almost 700 at the motor. Not bad for a home made twin pump setup!

 

[tscook3]

Looks good man! Wasnt hard was it? Now I got a question for you . Is that a big vacuum Y you got there? Very good Idea.

I just dynoed my car on pump gas with this setup. One 40amp relay with the wiring how I told you, and made 561 on 26psi, and went for 30, but aem hit the boost cut I forgot to raise. But at 6500 I was already at 580!

Figure thats almost 700 at the motor. Not bad for a home made twin pump setup!

Hey man, thanks! No it wasn't hard at all, but if it wasn't for you making it a little clearer for me I probably would have dished out some extra money I didn't have to! Yep, it is a plastic y vacuum fitting. Actually, I ordered a steel fitting but it came plastic. I was a little angry, but thought about it, and decided why wouldn't it work? It is really sturdy plastic. Got 10 of them off ebay for $12.

Great numbers! Congrats. That gives me a little hope with using one relay. Are you running a 40amp inline fuse? I will probably just stick with the way it is since it seems to work for you.

 

[1fastlaser]

Hey man, thanks! No it wasn't hard at all, but if it wasn't for you making it a little clearer for me I probably would have dished out some extra money I didn't have to! Yep, it is a plastic y vacuum fitting. Actually, I ordered a brass fitting but it came plastic. I was a little angry, but thought about it, and decided why wouldn't it work? It is really sturdy plastic. Got 10 of them off ebay for $12.

Great numbers! Congrats. That gives me a little hope with using one relay. Are you running a 40amp inline fuse? I will probably just stick with the way it is since it seems to work for you.

Were did you get them on ebay? Im gonna take a ride to grainger tomorrow, im sure they will have something.

Yeah I have a inline 40 amp on the way to the battery in the trunk right there. One 40amp relay. When I was first setting it up, bought a 70amp relay, but wound up never using it because it works fine with the 40amp. Its been that way for a year now, and has never let me down.

Thanks, im going back soon, figure I would try to squeez 650+ out of it on straight 93. I know I can do it.

 

[tscook3]

Were did you get them on ebay? Im gonna take a ride to grainger tomorrow, im sure they will have something.

Yeah I have a inline 40 amp on the way to the battery in the trunk right there. One 40amp relay. When I was first setting it up, bought a 70amp relay, but wound up never using it because it works fine with the 40amp. Its been that way for a year now, and has never let me down.

Thanks, im going back soon, figure I would try to squeez 650+ out of it on straight 93. I know I can do it.

Sounds good. I'm going to pick up the relay soon. Thanks for the info.

That's awesome man. Can't wait to see how that works for you. Good luck with it, I'm sure you won't have a whole lot of trouble!

Sorry, didn't see the first part of your post. Just type into the search bar on ebay "3/8 y fitting". There will be some results in the bottom "ebay stores" section. It was the first one when I just did it. The seller has a store called HHO Generator Superstore (12$ free shipping). I don't see why these fittings won't work ya no.

What is your set up now with bringing together the pumps?

 

[1fastlaser]

Sounds good. I'm going to pick up the relay soon. Thanks for the info.

That's awesome man. Can't wait to see how that works for you. Good luck with it, I'm sure you won't have a whole lot of trouble!

Sorry, didn't see the first part of your post. Just type into the search bar on ebay "3/8 y fitting". There will be some results in the bottom "ebay stores" section. It was the first one when I just did it. The seller has a store called HHO Generator Superstore (12$ free shipping). I don't see why these fittings won't work ya no.

What is your set up now with bringing together the pumps?

Its acually a big T since I couldnt find a Y, but obviously I didnt look that hard.

 

[bluegs03]

Doesn't gasoline dissolve plastic over time? I thought i heard that somewhere just trying to look out for ya on that plastic y fitting.

Hey man, thanks! No it wasn't hard at all, but if it wasn't for you making it a little clearer for me I probably would have dished out some extra money I didn't have to! Yep, it is a plastic y vacuum fitting. Actually, I ordered a steel fitting but it came plastic. I was a little angry, but thought about it, and decided why wouldn't it work? It is really sturdy plastic. Got 10 of them off ebay for $12.

Great numbers! Congrats. That gives me a little hope with using one relay. Are you running a 40amp inline fuse? I will probably just stick with the way it is since it seems to work for you.

 

[1fastlaser]

Doesn't gasoline dissolve plastic over time? I thought i heard that somewhere just trying to look out for ya on that plastic y fitting.

Some plastics will dissolve in gasoline. Others won't. Note that all gas cans these days are made of plastic. So, it is only some plastics that are soluble in it.

 

[1gDSM4g63]

It's better to rewire it using two relays and have the second pump triggered DSMLink, EMS or by a vacuum switch because turning both pump when only one is needed will wear down the pumps, prevent overruning at idle and save the current from the electrical system.

 

[907dsm]

Can you make me one?

 

[1gDSM4g63]

Can you make me one?

It actually pretty simple. All if new is a saw and a drill to make it happen.

 

[tscook3]

Its acually a big T since I couldnt find a Y, but obviously I didnt look that hard.

Oh ok. Gotcha.

It's better to rewire it using two relays and have the second pump triggered DSMLink, EMS or by a vacuum switch because turning both pump when only one is needed will wear down the pumps, prevent overruning at idle and save the current from the electrical system.

Yeah, two relays still is an option I am going to consider. I will look into the vacuum switch idea.

Can you make me one?

If you are really interested I could, but like he said, it really isn't too hard if you have the tools and right fittings etc. I could help describe it better or whatever, just pm me.

 

[need2boostpsi]

It's better to rewire it using two relays and have the second pump triggered DSMLink, EMS or by a vacuum switch because turning both pump when only one is needed will wear down the pumps, prevent overruning at idle and save the current from the electrical system.

why is this? why not just let both pumps run all the time, they dont draw that much power. and the stock line can handle to fuel return even with the engine off.

leave it simple. you start messing with vacuum switches and link controlled relays you leave to much room for error.

 

[1fastlaser]

why is this? why not just let both pumps run all the time, they dont draw that much power. and the stock line can handle to fuel return even with the engine off.

leave it simple. you start messing with vacuum switches and link controlled relays you leave to much room for error.

Exactly, why add fault points? Ive been running twin pumps for a year with no issue off one relay. Its never let me down. Adding more stuff that can fail is just asking for a melted motor.

 

[tscook3]

Yeah, I am going to have to agree too. Plus I really don't think I am going to need to go all out with it at the moment with my setup. I am kind of limited right now with the shortblock anyways. Seeing your great results with the same setup reassures me that this will work well for me also.

 

[Atuca]

Not to mention if one relay fails and you do a full boost pull, your car will unsafely run lean and could damage the motor.

If one relay has both pumps fail the car just dies from lack of fuel, other wise you could be in trouble and not know it til too late.

 

[1gDSM4g63]

why is this? why not just let both pumps run all the time, they dont draw that much power. and the stock line can handle to fuel return even with the engine off.

leave it simple. you start messing with vacuum switches and link controlled relays you leave to much room for error.

Not to mention if one relay fails and you do a full boost pull, your car will unsafely run lean and could damage the motor.

If one relay has both pumps fail the car just dies from lack of fuel, other wise you could be in trouble and not know it til too late.

Running two pumps on one relay is much more likely to blown the relay than running two in series. Most everybody running two pumps uses two relays with a Hobbs vacuum switch or a DSMLink/EMS that trigger for the second pump. And if Atuca or anybody else is afraid of running two relays you can hook up a LED as a precautionary.

That's just my input, I have done both the vacuum switch and DSMLink trigger and it works fine and it doesn't overrun at idle or cause current draw at idle. I just don't known what you all are running on dual pumps, but my relocated small Hawker drycell battery is already struggling at idle.

 

[99gst_racer]

^^^ Many guys (myself included) have two pumps running at all times. If each one was on it's own relay and one relay failed, it could be catastrophic in a high pressure situation. If they share a relay and the relay fails, the car shuts off.

If your one single relay is large enough, there won't be any problems. I have a Denso 280LPH and a Bosch 044 running through a 40 amp relay and I have no issues. I'll probably bump it to a 60 amp this winter just for added piece of mind, but to my surprise, the 40-amp has been doing it's job just fine.

 

[1fastlaser]

^^^ Many guys (myself included) have two pumps running at all times. If each one was on it's own relay and one relay failed, it could be catastrophic in a high pressure situation. If they share a relay and the relay fails, the car shuts off.

If your one single relay is large enough, there won't be any problems. I have a Denso 280LPH and a Bosch 044 running through a 40 amp relay and I have no issues. I'll probably bump it to a 60 amp this winter just for added piece of mind, but to my surprise, the 40-amp has been doing it's job just fine.

Same here, I bought a 70amp relay, but have yet to see a reason to change it. Ive been on the same relay if you wanna say for 6 years now . Still going for this whole year with 2 pumps running off it.

Id be scared of a hobbs switch not turning on, or a faulty wire, then the second pump dosent turn on, or turns off during a pull...not that it would but it just adds to potential problems that can accure.

 

[tscook3]

I think it is safe to say that a 40amp will be sufficient for most situations. Don't get me wrong, I see both sides of the situation and the advantages vs disadvantages, but in this point of time, I don't feel the need to modify my sending unit more, run more lines out, seal it up afterwards, and double up on my relays and wiring since it has been proven to work well for a couple people. Plus my buddy with the laser has a setup that is a lot more powerful than mine will be at the moment and it has been working very well for him on a long term basis.

 

[-red97rum-]

Well if you decide you don't want to use a plastic Y fitting, you can get this one in stainless steel: 3/8 barb Stainless Y fitting Kind of steep for what it is though ~ $36.00. I'm sure you could find a cheaper one out there.

 

[tscook3]

Well if you decide you don't want to use a plastic Y fitting, you can get this one in stainless steel: 3/8 barb Stainless Y fitting Kind of steep for what it is though ~ $36.00. I'm sure you could find a cheaper one out there.

Let me tell you, for the last WEEK or TWO I have been trying to find a good deal on one of these. It is almost impossible finding one of the damn things to begin with and when I somehow find one it is in the area of 30-50$. Of course t's are everywhere and they are dirt cheap. I think I am just going to go ahead and put it in with this plastic one and cross my fingers.

 

[-red97rum-]

Let me tell you, for the last WEEK or TWO I have been trying to find a good deal on one of these. It is almost impossible finding one of the damn things to begin with and when I somehow find one it is in the area of 30-50$. Of course t's are everywhere and they are dirt cheap. I think I am just going to go ahead and put it in with this plastic one and cross my fingers.

Yeah I know what you mean, I had a bit of trouble tracking down that one. You'll probably be okay with the plastic. I'd just check it once a month for the first couple months. Probably safe to say if it doesn't start breaking down by then you're good. You said you got a few of them off ebay right? Soak one in a coffee can full of gasoline and see what it happens.

 

[tscook3]

Yeah I know what you mean, I had a bit of trouble tracking down that one. You'll probably be okay with the plastic. I'd just check it once a month for the first couple months. Probably safe to say if it doesn't start breaking down by then you're good. You said you got a few of them off ebay right? Soak one in a coffee can full of gasoline and see what it happens.

Yeah they are without a doubt hard to track down. Yeah, I bought mine off of ebay. Ten of them for $12. They really aren't a cheap plastic. They seem to be really sturdy/durable. Probably one of the strongest plastic pieces I've seen. I'm just going to say hell with it and throw it in there. I definitley will check on it though. Might not be a bad idea about trying what you said but do you think it might be a little different when it is in the car/ under different conditions because it will be pressurized with the fuel traveling from the pumps?

 

[tscook3]

In case anyone is interested, I redid this yesterday. After attempting to install them the other day, I ran into a couple problems. For one, it was too long. Couldn't get the unit to seat down, seemed like the bottom of the unit was hitting on the gas tank. Also, it was IMPOSSIBLE to fit the float in without bending it (with the pumps side by side as in the pics above). Most of you know the size of the hole that we are working with. Not near enough room for two walbros and another object side by side to be squeezed into.

ANYWAYS, I figured this wasn't going to do it. The car is down for the winter anyways so I might as well do it the right way. So (in a nutshell), I disassembled it all, drilled another hole, ran my fittings, modified a couple things, ran my fuel lines and here ya go (much better):

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I like it a lot better this way!