12valve

I installed a High pressure lift pump form a 01 powerstroke, on a the 98 in my sig, which is about the same as a walbro from what i understand. And i never got it to work right, pressure drops to 0 psi even with Edge on stock...

i attached a pic, so you can see how i set it up.

dieselrob

what is your psi at idle? How do you have the pump wired in? Are you using a mechanical gauge? The regulator my be stuck open. I have a walbro from glaicer and run about 20 psi and it it only drops 3-4 psi when hooked to the sled, i have a mallory fuel regulator on mine.

bamadzl

That's exactly how mine is set up, but I used a Simflo regulator from Vulcan Performance. I assume you've tried adjusting the regulator. I had to adjust mine a bit. I get 19 at idle and about 16 at WOT.

Brad

oaborbag

I have the same kit as the above poster has, and I see very similar fuel pressure, 20 psi idle and 16-18 psi wot, hardly drops at all even with these big sticks. try adjusting the regulator.

sheriffav8r

Take the line from the tee to the fuel filter and run it into a pail. Bump the starter and check the flow. Give us a little more info on when you see "zero". You might also try a cheap pressure gauge right after the tee to see what pressure the pump is putting out. Adjusting the Swagelok takes a little time and you have to remove the fitting each time you adjust the hex nut inside the valve. An easy way to get in the ballpark with the Swagelok is to remove it and pressurize the valve with air. Set 20psi and see if the valve pops. Keep changing the air pressure and valve setting to get the valve in the general ballpark and then try it on the truck. If you see 20-25psi at the valve you shouldn't go below 10-15 at WOT on the VP. You need to isolate the exact problem and where it is in order to get good input from this site. In other words, work backwards from what you know: Check flow of pump only, check flow of pump plus regulator, check flow of pump/regulator/fuel filter, check for accuracy of fuel pressure gauge, check for any leaks, etc....

12valve

I did more testing from what ive described, and i dont get what could be wrong.
Putting a gauge directly to the pump, pegs a 60 psi gauge easily, i installed the regulator the way it came, and saw 17 psi with the pump running (engine off) i put a mechanical gauge before the fuel filter and have the edge pressure sender after the filter. both showed the same.
When i start up the truck pressure drops to 4 psi (idleing) and stays there.

Then i tried turning up the regulator almost all the way in (gave too much pressure,) so i installed a Holley inline regulator before the filter. that gave me a steady 16 psi at idle and while cruising. but once i floor it (on stock) i get 0-2 psi fuel pressure and it comes back up to 16 quiete slow!

i did different testing for a whole day.

i did run the fuel into a pail...

I did also swap out the swagelok regulator with another new one and same problem!

12valve

bump.... anyone with a homemade walbro setup please chime in

sheriffav8r

With all the mods you have you might be just running the system dry. Up the pressure to 25psi or so pre filter and try again. I think with dual CP3s and the like you have a major need for fuel. If you can get at least something above zero at WOT you can tweak your pre filter pressure. I'm not sure if the fuel filter canister can reliably take more than 25 psi but some others might have better input....

gotslicks

first off ditch the holley thats not gonna work!

2nd since its a ADJUSTABLE REGULATOR adjust it.
if you went almost all the way and it was too much....... back it off a little and if thats too much back it down a little more and if thats too much back it down some more and if thats too much bacl it down some more and if thats too much back it down a little more and if thats too much back it down some more and if thats too much bacl it down some more and if thats too much back it down a little more and if thats too much back it down some more and if thats too much bacl it down some more and if thats too much back it down a little more and if thats too much back it down some more and if thats too much bacl it down some more and if thats too much back it down a little more and if thats too much back it down some more and if thats too much bacl it down some moreand if thats too much back it down a little more and if thats too much back it down some more and if thats too much bacl it down some more and if thats too much back it down a little more and if thats too much back it down some more and if thats too much bacl it down some more and then if the regulator falls apart and you still got too much pressure then the regulator is bad!


just adjust it a little at a time

12valve

sorry its not for the comon rail,

its for the 98 in my sig, its got 100 hp jammers, and a juice edge for fueling (less then 400 hp)

why wouldnt the holley regulator work? i still had the swagelok bypass before the holley reg. so the swagelok would keep like 30 psi and the holley reduced it to 17.

Thanks for the input, ill try to put it all on again and see if that works, after adjusting it.

gotslicks

omg

the holley is just a block off
it just stops flow
it might work at idle but when volume is needed then what! it will be like sucking thru a straw!

the walbro is capable of going over 100psi

30 psi at idle is different than 30psi at wot
at wot the regulator/bypass adjusts until the pump can make 30psi
if the pump runs at 10% idle it might need to run at 50% wot

the way you got it set with the additional regulator is the pump wont go to 50% because you got a blockage in the line.
all your doing is sustaining 30psi between the 2 regulators!

can you see what im saying!

if you add another regulator the pump ONLY ONLY ONLY puts out 30 psi at walbro

just try to get it top 25 psi idle
ive been running 25 psi idle for years!

69plymouth

I would check and make sure you have no restrictions upstream from the pump. If the sock in the tank is plugged, you could have good pressure at low flow demand (idle), but as soon as you need lots of flow, no pressure. I would try the flow test into a bucket as suggested above. If you get lots of flow, this will verify everything upstream of your pump and the pump itself is good, check regulator, downstream restriction (filter). If not, try sucking from the same bucket, circulating. If flow is now good, it is an upstream restriction. If it is still not good, pumps toast.

sheriffav8r

I'm thinking if you're making 60psi at the pump you should be able to gradually up the Swagelok to get you to a little over 25psi at idle. Whenever the engine wants more fuel the Swagelok should try to adjust to 25psi with the 60psi pressure differential. Double check flow TO the Swagelok and adjust from there. Your pump works at the same rate all the time so it should put out up to the max when needed. The reason you run a Swagelok bypass is to take head pressure off the pump. If you put some regulators on the pump they just adjust the outflow and create large head pressures that hurt the pump efficiency and life....

gotslicks

please lets just get back to 1 regulator! then go from there!

SkyHarborCowboy

You can have 2000 PSI with 0.1 GPM of flow when no fuel is required (engine not running) as soon as you start your engine it is going to require more then 0.1 gpm of flow and your pressure will drop to zero and even possibly cause a vacuum. I dont know what the stock zero pressure flow of the Walbro is supposed to be but you "HAVE" to have some sort of flow restriction and/or pump issue for the problem you have described!

Go to your garden hose and put your thumb over the hose and open the valve all of the way and you wont be able to keep the end of the hose plugged and will spray water all over the place. Now close it quickly to just a trickle and you will be able to seal it for quite some time until the pressure builds up because there is no demand for it. As soon as your pressure relieve valve (your thumb over the hose end) cant hold the pressure any longer it will bypass it to whatever pressure your thumb can hold it at which will be relatively high because the flow is so low with very little demand.

Joe