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Enough fuel pump w/ E85 ??

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Old May 5, 2011 | 12:36 PM
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Default Enough fuel pump w/ E85 ??

Setup - 370ci, PT76GTS, 160# injectors, E85

Current fuel system - Dual in tank walbro 255's -10 main line to aeromotive regulator, -8 to each rail.

Looking for around 850-900whp. ... Yes on E85

Current system is probably maxed out? How big of a bitch is it to add a 3rd pump to the factory plastic bucket? Or would running 2 Walbro 340's be sufficient?
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Old May 5, 2011 | 12:39 PM
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You will be right on the edge. Search for Mightymouse. He put 3 Walbros in a bucket. He had pics and even video.
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Old May 5, 2011 | 12:43 PM
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Big power on e85 takes ALOT of pump. Time to look at the Magnafuel 4303 or 4302 at minimum. Great street pump and will supply what you need. I'm running 2 of them to make an attempt at 1500rwhp on e85.
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Old May 5, 2011 | 12:56 PM
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Um correct me if I am wrong but wouldn't you want to feed the railer before you hit the regulator??

I have always feed the rails then to the regulator then back to the tank
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Old May 5, 2011 | 01:16 PM
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Originally Posted by dschmittie1
Um correct me if I am wrong but wouldn't you want to feed the railer before you hit the regulator??

I have always feed the rails then to the regulator then back to the tank
Ya i wasnt thinking when I typed that... The main line is -10 goes to a filter then has a Y-fitting w/ -8 to each rail then comes back to the regulator.
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Old May 5, 2011 | 01:23 PM
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Originally Posted by pwrtrip75
Ya i wasnt thinking when I typed that... The main line is -10 goes to a filter then has a Y-fitting w/ -8 to each rail then comes back to the regulator.
ok that is how mine is just -8 feed to rails then to regulator.

I would think you will need 3 pumps in the stock tank or a Large aftermarket external on and a sumped tank would be good at that point
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Old May 5, 2011 | 01:40 PM
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I would ditch the duals and go external... Weldon or Magnafuel. I dont think your pumps will cut it. Im building something similar and looked at every which way to stay in tank and after a lot of research with that kind of power on E85 its pretty much not happenin in tank.
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Old May 5, 2011 | 01:56 PM
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Why wouldnt 3 walbros work? Seeing 2 pumps will support my power demands on gasoline with room to spare, the percentage more (subtracting the power gain) needed by E85 I would think would be well covered by 1 more pump. ??
Im not going external.. if the 2 wont cut it... im adding a 3rd.
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Old May 5, 2011 | 02:05 PM
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Originally Posted by pwrtrip75
Why wouldnt 3 walbros work? Seeing 2 pumps will support my power demands on gasoline with room to spare, the percentage more (subtracting the power gain) needed by E85 I would think would be well covered by 1 more pump. ??
Im not going external.. if the 2 wont cut it... im adding a 3rd.
IMO multiple pump setups are like a bandaid for a properly set up fuel system. My last setup was a single in tank, meth, with a KB BAP... IMO all the "extra" stuff (meth and BAP) is a bandaid for a proper setup.

Again.. this is my opinion.
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Old May 5, 2011 | 02:26 PM
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Not sure what "BAP" is. But I dont see how multiple pumps is a bandaid. Its a street car so I'd prefer multiple pumps over one. Cost is a factor also. It cost probably $100. to add a 3rd fuel pump. A whole new fuel system way more than I want to spend.
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Old May 5, 2011 | 03:07 PM
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On automagicls1's car I cut the plastic bucket out below the fuel sender and hung 3 pumps there, -10 line to a Y block dual 8s to rails, regulator after rails, 160lb injectors. Plenty of fuel at 1100rwhp.

BAP - Boost a pump is my guess.
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Old May 5, 2011 | 03:57 PM
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Originally Posted by pwrtrip75
Not sure what "BAP" is. But I dont see how multiple pumps is a bandaid. Its a street car so I'd prefer multiple pumps over one. Cost is a factor also. It cost probably $100. to add a 3rd fuel pump. A whole new fuel system way more than I want to spend.
BAP.. boost a pump as mentioned.

Im going to use mine on the street too... with a Magnafuel external that they recommended and a fuel cooler on the return to keep it from overheating.

Anyways.. good luck... Id like to see how it all turns out.
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Old May 5, 2011 | 06:00 PM
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Originally Posted by pwrtrip75
Why wouldnt 3 walbros work? Seeing 2 pumps will support my power demands on gasoline with room to spare, the percentage more (subtracting the power gain) needed by E85 I would think would be well covered by 1 more pump. ??
Im not going external.. if the 2 wont cut it... im adding a 3rd.
You missed the bus bro. If you're shooting for say 900rwhp, you need 1800hp worth of fuel pump (based off gasoline ratings). Ask me how I know... You can put 5 walbros in there if you like, ain't gonna cut it. Each additional pump you add does not double the volume, it only adds a smaller and smaller percentage.
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Old May 5, 2011 | 06:15 PM
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Originally Posted by pwrtrip75
Why wouldnt 3 walbros work? Seeing 2 pumps will support my power demands on gasoline with room to spare, the percentage more (subtracting the power gain) needed by E85 I would think would be well covered by 1 more pump. ??
Im not going external.. if the 2 wont cut it... im adding a 3rd.
I bet you with 3 gss 340 walbro's going to a -10 feed, with a -8 return you can hit your 800-900 wheel hp.

Do it to prove everyone wrong!

I was looking @ a mustang today that is 91mm turbo and just made 920whp on a glide on e85. He does not have a fuel system that supports 2000hp.

Good luck, Chris
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Old May 5, 2011 | 08:30 PM
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I think adding another walbro will get you there.

At least with the Walbros you dont have to drive around with one massive fuel pump bypassing fuel through hot rails and regulator heating the fuel till it boils.

-Im using one Magnafuel 4303 and looking for 1000rw on E85. We'll see.
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Old May 5, 2011 | 08:36 PM
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one single 4303 magnafuel wont make 900rwhp through a th400. two cars i have done lose presure around 835-850rwhp. boosta pump might get you to 1000rwhp. twin walbro wont hit 700rwhp.
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Old May 5, 2011 | 08:40 PM
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Originally Posted by gennex
one single 4303 magnafuel wont make 900rwhp through a th400. two cars i have done lose presure around 835-850rwhp. boosta pump might get you to 1000rwhp. twin walbro wont hit 700rwhp.
I'm actually running 2 magnafuel 4303s each with its own 40amp race BAP trying for 1500rwhp. We were losing pressure at 1200rwhp without the BAPs. Hopefully they will get me there.

Last edited by 93formto98T/A; May 5, 2011 at 08:51 PM.
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Old May 5, 2011 | 08:42 PM
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Ive seen a couple cars make over 1000 on E85 with the 4303 with autos. Every setup is different. What base pressures were they running?
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Old May 5, 2011 | 08:43 PM
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Originally Posted by 93formto98T/A
I'm actually running 2 magnafuel 4303s each with its own BAP trying for 1500rwhp. We were losing pressure at 1200rwhp without the BAPs. Hopefully they will get me there.
Wow thats a lot of fuel.
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Old May 5, 2011 | 09:05 PM
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i ran my personal car at 43psi base to try to give the pump a chance. i know hit it with twin 15gal alky injection, so far so good,


did the boosta pump help alot?
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