Since I've installed the walbro 255 in tank fuel pump, I have to turn the ignition on for about two to three seconds to let the fuel pressure build up before my truck will start up. Does anyone else have a starting up issue that is running the walbro 255 in tank pump? Thanks
Current Mods: 6.0/4L80e with Trick Performance Front Mount
Audio: Pioneer avic-d3, Memphis Belle, Two 12" Rockford Fosgate P3 shallow mounts, Memphis MS-Qs, and custom vinyl enclousure.
i have the same issue. the 340s i have the check valve isnt working. they were doing this brand new too. not a big deal except for first fire of day
2002 Lightning - GT headed 5.5Litre w/ Twin 7665s
2002 Silverado - 427Lsx w/ Twin gt4202s
2010 Silverado crewcab Z71 - 5.3litre w/ procharger
2000 Wrangler - 5.3litre with some stance
2014 Xsport- 3.5 Eco boost
412 Motorsports
it ain't that I'm too big to listen to the rumors, It's just that I'm too damn big to pay attention to 'em..That's the difference
Could I resolve this by putting a stock pump back in the tank and adding an in-line pump? Because my truck does it on every fire up... its getting pretty annoying and people look at me like my truck is some broken down p.o.s..... only if they could see it when the hammer is down!! haha
Current Mods: 6.0/4L80e with Trick Performance Front Mount
Audio: Pioneer avic-d3, Memphis Belle, Two 12" Rockford Fosgate P3 shallow mounts, Memphis MS-Qs, and custom vinyl enclousure.
inline pump is a bandaid. you could install a inline check valve or replace pump with one that has a working checkvalve. i got used to it. cycle key let it build pressure and fire it
2002 Lightning - GT headed 5.5Litre w/ Twin 7665s
2002 Silverado - 427Lsx w/ Twin gt4202s
2010 Silverado crewcab Z71 - 5.3litre w/ procharger
2000 Wrangler - 5.3litre with some stance
2014 Xsport- 3.5 Eco boost
412 Motorsports
it ain't that I'm too big to listen to the rumors, It's just that I'm too damn big to pay attention to 'em..That's the difference
i have a stock pump and im having this same issue.. if the truck sits for a decent amount of time, ill have the same problem.
i thought my fuel pressure regulator might be bad, but my fuel pressure gauge, while driving, doesnt show that.
ive noticed the pressure on that guage go up... and then slide down while the key is in the run position, before starting.
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Mine did the exact same thing when I hooked a fuel pressure gauge to it.Originally Posted by MidwestSS
Current Mods: 6.0/4L80e with Trick Performance Front Mount
Audio: Pioneer avic-d3, Memphis Belle, Two 12" Rockford Fosgate P3 shallow mounts, Memphis MS-Qs, and custom vinyl enclousure.
I can only help the hijacker here (sorry Mike) but that's not normal. Driving test matters not for a restart pressure situation. If the pressure bleeds off as soon as you cut the key, there is a problem. Depends on what year (returnless or not) what the problem is but it's most likely the stock pump.
no problems here with mine...
'13 silverado LT...stock
'11 lt 4x4 z71..tvs1900
'01 gmc twins 6.0 jakes 400 ladder bars w/ coilovers tuned by nelson performance
No problems with in-tank Walbro 255s. If the pressure's dropping with the key in Run after priming, I'd be suspicious of fasteners (assuming the problem started after swapping pumps).
5.3L '86 Silverado (E/T: 14.37s @ 94mph) - First Time Out!Test-n-Tune (Nov 23, 2008) - 13.65s @ 98mph
Both of my trucks worked great with the Walbro. Maybe you can install a check valve inline somewhere. I would try a new pump if it were mine.
2006 Superior Blue Trailblazer SS AWD, Stock as a rock
Sold: 2002 GMC Sportside Denali front end with a 2002 LS1, FLT level 5, Yank 2600, Trick Turbo, T76, Nelson intercooler, 60LB injectors, Warbro fuel pump, Eaton locker, Magnaflow, 3.42, Nelson Performance Tuning (speed density).
Sold: 1981 GMC LB RC 1500 2002 4.8L 4L60E 12 bolt 3.73 Richmond Lock Right AC PS Nelson Performance tuning
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