i just bought a 01 tahoe with 133000 miles with a 5.3. its 4wd yada yada. it has 48psi fuel pressure on the rail (relief valve on passenger side) its supposed to have 55-62psi i believe. it drops to 0psi after shutting off and it drops quick. the dealer said he put in a new fuel pump, but it dont run like it. the pump comes on but seems to not hold prime or it is weak. he said he would look at it tomm and fix it at no cost to me i hope. does this seem to be fuel pump?
96 Silverado rcsb
5.7l Vortec
Exterior: 2 inch drop shackles, Centerline Titan 20" Wheels, clear lights, Debadged.
-Exterior to come: 2-4 drop, Tinted windows, Cowl hood, Green Calipers
-Performance mods: Flowmaster True Dual exhaust
-Performance to come: Tune, CAI, Cam, Spray, Posi, gears, stall, headers.
That or a line inside the tank bleeding off. I'll tell you next week when I open mine up. My 08 is doing the exact same thing.
1969 Chevy RCLB C10 350/TH400 SOLD
2007 Chevy RCSB 4.8 4x4 LS SOLD
2008 Chevy RCSB 5.3 4x4 LT SOLD
2010 Chevy CCSB 6.2 4x4 LT SOLD
2005 GMC CCLB DRW 6.6 Duramax 4x4 191,000 and counting
2013 FORD CCSB F350 6.7 Powerstroke 4x4
FPR might be bad, or like stated the line in the pump could be cut or rubbed through. When I did a big intank pump swap, I noticed that the clear line that runs from the top of the pump into the hat of the bucket, was infact rubbed through from rubbing on the steel posts in the bucket.. Could be a weal pump, but they are the 2 things I would look at for sure
JOHN
it hesitates when first starting and i put it in gear, but when i gie it gas its stil does for a second then its fine.
96 Silverado rcsb
5.7l Vortec
Exterior: 2 inch drop shackles, Centerline Titan 20" Wheels, clear lights, Debadged.
-Exterior to come: 2-4 drop, Tinted windows, Cowl hood, Green Calipers
-Performance mods: Flowmaster True Dual exhaust
-Performance to come: Tune, CAI, Cam, Spray, Posi, gears, stall, headers.
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