Walbro and boost ref regulator

[IowaCummins]

just ordered the Jegs style Walbro 392 at 255lph. http://www.jegs.com/i/JEGS/555/159001/10002/-1

also the mallory boost referenced regulator. http://www.jegs.com/i/Mallory/650/4307M/10002/-1

with next day shipping so i can have it for the dyno day sunday! i messed up last time with my 5x.012s and stock diaphram LP. ran out of fuel at 2700 rpms what a joke made like 207 horse.
after that i installed a holley blue and it held good but not the greatest.
just installed some 7x.014 injectors and they will draw that holley down to nothing so im not making the same mistake as last time. i have to get fuel to her other wise might as well not even dyno.

So as of saturday only thing that should be holding me back from making some good power is my tranny. and i guess air too but something like s475 might fix that later on next year.

my goal is to be above 300RWHP not really expecting any high numbers on torque due to the tranny

[Mark Nixon]

Funny you mention fuel pumps and crapping out.
The stock lift pump gave up on the car hauler.....finally.
After trying 2 other stock (junk) lift pumps, I gave up and bought what amounts to a Holley Black pump.

It's never started up cold as good as it does now, and I never realized the difference until after it was installed.
Years ago I had a Holley Red on another converted 1 ton, same deal, the ease of it made it worth the money.

It's by far the BEST "upgrade" you can do on a 1st gen.

Mark.

[Remps]

Yup, stock LP's ain't good for much! My 93 can suck the pressure down to .8 psi. Puttin a fuel pressure gauge in the 90 tmo.

[oldestof11]

Put as much 3/8" line as you can. Stock is about 5/16".

This way the pump will pull through and push through the same size. No restrictions.

Also go to Ace Hardware and bring the regulator with you. Get plumbers tape to get everything sealed right. Also, the fittings I used for the AN8 lines was a 3/8" nipple that had a SEPARATE nut to hold it down. This way it had a pressure style fitting and didn't require a AN8 threaded nipple.

HTH.

[IowaCummins]

oh yeah i already have half inch lines to the pump inlet with a draw straw in the tank. have two large fuel filters that are 10 and 3 micron. i now have the stock fuel return but going to upgrade it to 3/8" and tie in the fuel return from the regulator. yeah my holley blue made a difference when i had the small injectors but these just fuel way too hard for that little of a pump.

[pulltilbroke]

You realize that the 392 only puts out about 64 gph don't you where as your blue puts out 120 gph?

[1STGENFARMBOY]

Yeah he is right 67.38 to be exact, the holley blue is 120gph and the black 140gph, i hope you did'nt already buy this stuff
cause i'm not shure it's gona work for you.

Dar

[Ace]

You realize that the 392 only puts out about 64 gph don't you where as your blue puts out 120 gph?

Those are free flow numbers and pretty much meaningless as far as their ability to supply fuel to a diesel engine is concerned. The Walbro is rated for 110psi wheras the Holley Blue runs around 10-15ish IIRC. They are completely different pump designs. The Walbro is a much better pump.

[1STGENFARMBOY]

Take this with a grain of salt, but the way i read the flow charts the walbro 392 pumps 68gph @ 20 psi, the holley black
is 120 gph @ 9 spi, please if i'm wrong correct me so i don't pass on false info, i have taken false info before and blew
some money that i would'nt have if i would have researched.

Dar

[Ace]

Here's a chart for the Walbro:



Show me the one for the Holley.

[BC847]

With Sheide 6x.016" EDMs and a bunch of other crap, I'm able to put over 430hp and 1000ft/lbs to the ground, make a quarter mile pass in 12.81, and never pull the IP's inlet fuel pressure to less than 15psig. That's with a Walbro 392.

[Ace]

Take this with a grain of salt, but the way i read the flow charts the walbro 392 pumps 68gph @ 20 psi, the holley black
is 120 gph @ 9 spi...

It looks to me like the Walbro delivers >40GPH at 110psi. What's the Holley flow at 110psi? Oh I forgot, what's the MAX pressure delivered by the Holley again? You gotta remember some fluid dynamic basics. Pressure is resistance flow, etc...

A simple demonstration will explain. (impractical, I know, but bear with me ) Get the two pumps, 4 big buckets, four lengths of fuel line, a battery, some wire and about 10 gallons of of your favorite test fluid. Diesel fuel would be optimal. Wire and plumb up everything so the pumps are set to empty one bucket and fill the other. Start them both at the same time. You will then know the difference between these two pumps.

[1STGENFARMBOY]

I,m not sayin the walbro ain't a good pump and won't do the job, look at BC's truck not many of us will ever make that kind of power,
but we don't need 40 or 110 or even 20 psi for that mater, our pumps seem to hold 14psi just fine without a $100.00 regulator, I,m just sayin
that (IF) your on a budget the holley or the knock off even looks like it will do the job fine from what poeple that have them are reporting.
i'm not startin a pi$$in match. heck sometimes i wish i had the walbro if it's quieter than mine. I really don't know why the pump on the
O/P droped off, i know his injectors are bigger than mine but i cant get my holley black below 10 psi on DDP 4's.

Dar

[Ace]

Yeah he is right 67.38 to be exact, the holley blue is 120gph and the black 140gph, i hope you did'nt already buy this stuff
cause i'm not shure it's gona work for you.

Dar

????????????????????????????????????????

The only advantage to the Holley and similar rotary vane pumps is they don't require a regulator in this application. They are internally regulated to a relatively low psi simply because they can't move much by design at higher pressure. That's where you get the correspondingly high GPH numbers.

I use one as a backup pump for just that reason alone - simplicity. It's not "normally" intended to be used for anything but priming the fuel filters.

[Ace]

oldestuff, don't take this wrong, just an observation, but I don't think I like your plumbing! Looks like you've got the pump output running through rubber line all around the electrics on your inner fender. Please tell me that is high pressure tubing and "NOT" worm gear clamps on a hose barb coming out the high pressure side of that pump.

Just sayin'....