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Walbro 400Lph Problem

Hadouken

By Hadouken,
in Engines & Forced Induction

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XKLABA
XKLABA

Don't flatter your self about the non return valve idea, we have been using them for more then 20years in the race cars My brothers car, I don't have a pic of mine in my phone It runs a VQ35HR wi

scotty nm35
scotty nm35

Because it is perfect, for me and my setup. I guess you just don't appreciate the hard work I put into it, designing a failsafe system on my own, using a single reg and return when everyone on here wa

Ben C34
Ben C34

To seperate the banks and use one reg wouldn't it go Pump > rail> non return > tee piece to common reg on both sides? Pretty easy.

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Hadouken Grand Master

Hadouken

Posted
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Posted

33 and 34 GTR's have the same cradle orientation. Mid tank. Whereas the 32 GTR and gtst's have the bottom of tank orientation.

The 32's and gtst's would have no problem with the walbro due to it being submerged all the time.

But if you had the completely enclosed walbro then no one would have a problem.

My believe was only the walbro with the bleed/prime holes have a problem due to not being submerged the entire time in the tank, 33 gtr 34's. This was tested when we took a walbro 400l with (the one with the priming holes) and submerged it in a jerry can, it pumped like a baws. But as soon as we left it out of fuel for 30min and went to retest (this time not submerging it) it did not want to pump until about 10 sec of running it. Now that is a lot of priming time for a RB, which led to our conclusion that the 400l was not suitable for a fuel tank that did not have the fuel pump submerged at all times.

Now Im the guy that has problems with weird shit, so it would not surprise me if Im the only 1 that has problems with it. But I did also contact walbro and they said the same as what I said in my above paragraph. Maybe they made a sleight change. Maybe im just unrucky.

Bosch 044 ftw haha

  • 4 months later...
SS8_Gohan Grand Master

SS8_Gohan

Posted
Posted

to be honest, i think all pumps are fine with E85, it's just capacity that you have to worry about

i'm using a drop-in Nismo pump that's probably been in the car since... early 2000's? no issues with fueling on E85 for nearly 2 years now.

SS8_Gohan Grand Master

SS8_Gohan

Posted
Posted

my old car has seen close to 5 years of constant E85 use with a drop-in Walbro (GT-T, walbro would be '07 vintage) no issues from that either.

i think the 'E85 specific' pumps might be a bit of marketing, with some minor changes

battery Mentor

battery

Posted
Posted

The E85 specific Walbro 400L has sealed pump contacts and plugs as ethanol can conduct electricity.

I always thought that pure ethanol was non conductive and that is was more a case of the contaiminets in the ethanol that are conductive. I mean if your saying that ethanol is conductive then you could also say that regular PULP is conductive to an extent.

I might have to test some E85 in our oil insulation resistance tester at work :)

  • 2 weeks later...
B-rice Mentor

B-rice

Posted
Posted

I wanted to buy one of those 400lph Walbro pumps but it says not for lightly modified vehicles. Im not looking into buying a small pump now then upgrade again in a short time space. By lightly modified is a car with an ECU,AFM,Exhaust and 550 injectors lightly mod?

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