NEED HELP Installing 2 walbros.

[Essential_DSM]

I'm going to run off two walbros and how can i wire up the second one.

 

[vancitydsm]

get 2 rewire kits and use 2 relays with the stock power wire activating them.. if not just use the 1st relay to activate the second one

 

[Essential_DSM]

Where can i acquire these kits and relays?

 

[snowborder714]

Where can i acquire these kits and relays?

ebay - just search for 'fuel pump rewire'

 

[Supa Dexta]

edited.

 

[DJYoshaBYD]

^^^ thats how it should be done...

wiring in series saves alot of headaches with using rewire kits and all that..

 

[Essential_DSM]

Thank You.

 

[Supa Dexta]

Put mine together today:

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[eboy0]

Put mine together today:

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Damn, that look sexy!! But umm, this may sound stupid, where would I get some of those little crimps ## using on the lines?

 

[silver bullit]

Put mine together today:

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You got a list of parts or a link so i can build the same setup?

Any more pics, makes for a good write up.

 

[tkelly27]

Isn't it in series the voltage is cut in half between them? It's been a while for me with the whole electronics thing. Couldn't both wires be split at the ends to create a parallel system? That way it's no less safe than if you had one hose coupling come off...

 

[Supa Dexta]

It's really just pieced together at this point. Mostly with stuff I had lying around.

Theres an 8an bulkhead, and its nut. Attached to it is an 8an pushfit nipple, all from summit racing... (I had to shorten it to only one barb) The Y is just one I had here, 3/8 I think, you can see where I stretched the hose from it over the 8 an (I heated the end up in boiling water, and worked it larger to fit over)

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This is the Y I had here:

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Again, each end had to be shortened to fit it all together.

And the clamps are oetiker clamps, They crimp on with oetiker pliers..

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17 and 15.7mm I used. So really I can't recommend this to anyone the way it is, the over all idea sure, but it's too half assed to put my name behind it yet.

And for my sender top:

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Those are called "cable glands", twist the top and it tightens over the wire you run thru them. I have to enlarge that hole to 19mm I think for the bulkhead, and run the wires, and then it should be ready to use.

 

[Ravenous]

Now I may be missing something here, but if a pump dies in series or parallel it still dies, thus halving the amount of fuel being pumped.... correct? Now if one of the pumps has a "critical failure" where the flow of electrical current is stopped completely, wouldn't the series fuel pumps both go out at the same time, so now you have no fuel. Whoever said that your should wire them in parallel with two relays and two kits probably had the most reliable setup.

 

[Supa Dexta]

edited.

 

[Ravenous]

Well that does make sense, although I don't know if it would be any better from a safety stand point.

 

[Supa Dexta]

It would seem to me the car would just suddenly die (yes go lean for a second), but the other way you would continue to run on half the gas, going lean for a much longer time and end up munching the engine.

 

[leathaltsi]

how much power are you guys looking at. That a 225lph hp cant handle.

 

[Supa Dexta]

Hoping to be around ~600 this summer.

 

[leathaltsi]

What size pumps are you running?

 

[Supa Dexta]

Check my profile.

two 255's.

 

[Ravenous]

I tend to think of things from street driving or road racing, where i would rather keep it running and sacrifice the engine so i can at least stop or steer for a bit longer, making that much power I'm figuring that those aren't the priorities... Yet I do have to agree with you good sir. Your method is just as safe as me just running my one fuel pump.

 

[Essential_DSM]

Nice. Where can I acquire those parts. Thanks for posting.

 

[bastarddsm]

each pump will receive about 6.5v. i would defiantly wire them in parallel not series. At 6.5v they will pump significntly less fuel than they were designed to.

 

[vancitydsm]

Just run them with 2 relays and parallel like i said earlier. Why would you want to run anything in series? If you are relying on 2 pumps to supply a certain amount of fuel and you lose half your volume you are not going to lean out, you will more then likely get a lean miss fire and let off the throttle. So what if your pump goes bad on a series setup and the motor is still fine , thus the circuitry to the 2nd pump is still complete wouldn't that cause a lean situation? For maximum efficiency, safety and power parallel i don't care what some " huge power " guy says.

 

[Supa Dexta]

Yeah I'll have to think the wiring over before I install it, they would only get half the voltage and that doesn't make sense to do. Easy fix though.. Going by what someone said without thinking it over fully, I should know better.

.. But why would you need 2 relays? (just if you have one that can't handle the current 2 pumps would draw you mean?) Mines 80 or 100amp, so it would be fine to supply two pumps in parrallel.