Dual intank fuel pumps

[BluemeanieTSi]

i started trying to figure out how to put dual pumps in the stock housing but that wasn't happening without major hacking. since it was my only housing i had i started looking for alternatives so i decided to build my own.

the housing cost me about 10 bux and 2 days to make, i still need to wire it.

here's what i started with but this ended up not working well due to return line placement.

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the housing isn't all that thick it was the thickest metal i could find at the local tractor supply company. i just cut a circle to match the upper piece and welded a support rod to it, then welded the inner ring piece for the gasket, test fit to make sure it sealed ok then started on the feed lines. they are 3/8th brake line i bought 3/8th brake unions and ordered 3/8th flare to 6 an fittings from summit. the housing cost me around 10 bux and the fittings cost around 15 total for that part.

(ignore the twisted screens the pumps weren't secured yet for this pic)

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after about a days work (i'm not much for planning things out) i realized i had no room for wiring or a return line. soooooo i started over

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the two 45 degree 6an hose ends clear the back seat with no modification following the factory feed lines. the "y" block is a BG (barry grant) fuel block i got from jegs for around 30 bux and it is 3/8th NPT, it comes with a pressure tap source that needs to be plugged (i see no need to put a gauge back there) the lines are 6 an then 3/8 to 6an 45 degree fittings for inlefts with a 3/8th to 8 an and 8 an line from then on.

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i kept the float for street car use, and i kept the gauge light crap just so i didnt' have to cut it apart. the return line is 3/8th and the vent is 1/4 brake line, i'll be using the factory feed hard line as a larger return line so i dont' have to run another line under tha car i'll use the existing one which i think is 5/16ths

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everything is soldered with plumbing solder and leak tested. here's a good shot of the flare to an fittings from summit.

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here's what i have so far, all the lines (not cut to length) and the filter i will be using (caution this filter is over a foot long) everything is 8an from the y block up including the rail. i will be using a magnafuel fuel pressure regulator as i was not impressed with the aeromotive one i had been using in the past.

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questions, comments, personal experiences......for reference i'm planning on an fp3065 for the setup at the moment.

 

[BluemeanieTSi]

pic installed

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[BluemeanieTSi]

this is the regulator

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[Morphius]

Do the 2G fuel pumps on the OEM unit package that close to the top of the unit as you've shown on the one you made?


The 1G fuel unit allows 2 pumps to be used fairly easily due to the offset bracket. The t fitting can be added inside the tank, which eliminates fabbing anything up.

 

[BluemeanieTSi]

Do the 2G fuel pumps on the OEM unit package that close to the top of the unit as you've shown on the one you made?


The 1G fuel unit allows 2 pumps to be used fairly easily due to the offset bracket. The t fitting can be added inside the tank, which eliminates fabbing anything up.

pumps sit exactly where they would in the 2g from the factory

 

[Vegas Smith]

What exactly is the point of this project? Are you running out of fuel?

 

[gaddis]

Nice work. I'm trying to decide between dual in tank pumps like your setup, an external inline, or a second switchable pump with a fuel cell.

 

[igopoopy]

What exactly is the point of this project? Are you running out of fuel?

im with him^^^

 

[gaddis]

Those of you who don't understand this project don't understand what it takes to get into the 10's or low 11's

 

[herblove]

This is a interesting project. Looks good. Let me know if you have success with it

 

[L2RTSiAWD]

For the record people have gotten into the low 11's and 10's with only 1 fuel pump.

That being said I thinks it's a great custom plus allowing you to keep the float for street use.


Also deleted some off-topic posts that of no use.

 

[Mirage2LTurbo]

I've seen 500whp dyno sheets on a standard Walbro 255.

 

[volcom121]

Wow thats some nice fab work there.

Walbro 255 is only good for around 500whp, Try 600 and...

 

[MNGSX]

some single pumps can feed up to 1000hp...


You could have sumped the tank and ran a big external single.... Less work better performance.

 

[Lee'sGSX]

Hey man Looks good, nice work!

 

[Morphius]

Depending on what pumps he's running, he likely did it for sake of cost.


I did it because it was cheap and easy.(at least easier on a 1g)
Stock pumps are dime a dozen and I've got ten+ pumps laying around.
Two stock pumps in parallel are at least equal to or more than a Walbro 255.

 

[91AWDDSM]

Wow thats some nice fab work there.

Walbro 255 is only good for around 500whp, Try 600 and...

255 litre per hour is equal to 4250 cc/min.
thats 1063.5 cc/min per cylinder. or 1328.125cc injectors at 80% duty cycle.
unless my math is wrong, 1050cc worth of fuel can support 540-ish hp.

that seems really low....

 

[BluemeanieTSi]

just to clear things up i did it for a couple reasons.

1: i dont' like the fab work for external pumps with fuel cells
2: i'd rather spend 100 bux more for 1 more pump and have plenty of fuel than "oops looks like i ran it a hair lean kaboom"
3: i like custom 1-off parts and i figured not many people have gone that route
4: i'm shooting for 500-600whp now and i ddin't want to sit the fence
5: feul cells are illegal for street class at the track i race so i wanted to stay in street brackets
6: cuz i could and it was still 100 bux cheaper than an external
7: i've heard externals burn up on street cars.

hope that clears things up, i do realize how much some people have made on single pumps but for the cost/peace of mind of knowing i'll never run out of fuel i think to me it's worth it.

 

[BluemeanieTSi]

some single pumps can feed up to 1000hp...


You could have sumped the tank and ran a big external single.... Less work better performance.

took me a couple hours to make once i got it right...and the float still works

 

[GRNDSM]

255 litre per hour is equal to 4250 cc/min.
thats 1063.5 cc/min per cylinder. or 1328.125cc injectors at 80% duty cycle.
unless my math is wrong, 1050cc worth of fuel can support 540-ish hp.

that seems really low....

That is close, but you are overlooking one major factor. If you are running 35psi of boost, on top of 45psi of base fuel pressure, your fuel pump now has to supply 80psi of fuel pressure. Have any of you “critics” ever looked at what our pumps flow at 80psi? 255HP drops to around 200lph (regular 255 drops much lower), which is still pretty good, but you are now getting into a questionable range, especially if you get any type of voltage drop.

I ended up using two pumps in “series”. My COSMO pump feeds my Paxton/A1000 fump. So far, it has supported 40psi on top of 45psi of base fuel pressure, without dropping the pressure. I did it mostly because it was easier to do it and because my car is mainly intended for racing. But if this was daily driver, I probably would have used two pumps in parallel , similar to what BluemeanieTSi has done. Nice job!

I think that Dentsport should offer this option for 1G’s: http://www.dentsport.com/dsm_fuel_housing/

 

[Tevenor]

Although there are other ways of accomplishing the same thing, the work is quality and it solves the issue. Nice work.


Leon, what's up with those DSG parts? No return? No Vent? Or are those "plug caps" the passthroughs for making your own bulkhead setup?

 

[BluemeanieTSi]

thanks for all the support, figured i'd get some "what the hell u need that for" comments but to each his own

 

[GRNDSM]

Leon, what's up with those DSG parts? No return? No Vent? Or are those "plug caps" the passthroughs for making your own bulkhead setup?

First of all, I just want to make sure that I am not in any way connected to those guys. I just think that they have a neat product.

Second, Sean, you need to step away from 2G’s for a second . 1G housings do not have any of those features .

I believe that they made those SST housings to replace rotted out 1G/GVR4 housings. Which, if you can find, you can only buy with a stock fuel pump for around $400.

But this thread made me think that this would be a neat option for them to offer… I shouldn’t be much more money to add one extra line.

Leon

 

[BluemeanieTSi]

we've made those for 1gs here too...same wya as i made the dual for the 2g cept much easier for making a 1g one.

 

[GRNDSM]

we've made those for 1gs here too...same wya as i made the dual for the 2g cept much easier for making a 1g one.

So are these thing already for sale? I thought that yours was just "one of a kind".