30th t/a

iTrader: (51)

Im going nuts trying to figure this out.
I keep having this low fuel pressure issue.
Im on fuel pump #3. Yeterday I installed the 3rd pump, truck ran great, a day later now is throwing lean bank 1 code.

The last 2 pumps did the same thing, truck runs great for a few days, then CEL comes on, then truck barely runs and fuel pressure will be garbage, like 40@Idle And 25 while driving.

What could cause this

G Atsma

Bad regulator
Line sucking shut before pump( in tank too)
Clogged filter
Cheap pump
Too-small pump

30th t/a

iTrader: (51)

If any of what you listed was the case, How could the truck run absolutely perfect (right after I install a new pump) with perfect fuel pressure, and then after about a week or two, barely run and have low fuel pressure?

I keep racking my brain on this

01CamaroSSTx

iTrader: (3)

Same new pump? What kind of pump? Too small of pump? Perhaps your burning up pumps.

G Atsma

OK, let me narrow it down-
Cheap pump
Too small a cheap pump(Pumping JUST enough but burning itself out doing so}

Che70velle

iTrader: (6)

pdxmotorhead

Too small of power source (Wiring) to the pump will burn them up..

01CamaroSSTx

iTrader: (3)

I was thinking the same thing also. It could be your clogging pumps due to trash in the system.

30th t/a

iTrader: (51)

This issue is on my stock 01 silverado with a 4.8
The pumps are from A1 auto and just a direct replacement pump.

I cut a trap door in my bed since the truck is a rust bucket beater. I can see inside the tank pretty good.
Im not gonna say its spotless, but its not that bad.

sjsingle1

iTrader: (1)

i am going to assume you used new fuel line in the tank ? my old line when i pulled my bucket was totally shot and leak city

30th t/a

iTrader: (51)

Not sure what line ypur talking about.

The fuel pump and bucket is one complete brand new assembly. All you do is drop it in the tank, connect it to the existing fuel lines and your done.

JoeNova

Do you still have the old ones? You can measure resistance between the pump connectors to help see if the pump itself is failing. I guess without checking a fresh one, you wouldn't have anything to check against though.

Chances are, you're either sucking up trash or its an electrical issue. No way the pump is too small to have low pressure at idle.

30th t/a

iTrader: (51)

Yes, I still have the old fuel pumps and since I cut a trap door in the bed, I can get to the new pump in 5 minutes to check it.

Btw, its day 4 of driving the truck back n forth to work and 3 hours of driving to go look at another truck for sale. No issues.

thanks for the tips.

fst100

iTrader: (5)

does the replacement assembly come with new fuel pressure regulator or did you swap them over to the new assembly?

Old Geezer

iTrader: (3)

^^^ This.
My NAPA dlr quit selling aftermkt pumps, for the trucks.
After he had a couple pissed off customers, that had repeated failures, he referred them to GMPD.
End of the problem[s].

30th t/a

iTrader: (51)

No, it did not come with a new regulator.

the fuel pressure regulator is located on the the fuel rail. so im not im not sure what you mean by swapping them over to the new assembly.

fst100

iTrader: (5)

I don't know how the truck setup is but if its similar to the ls1 style there's a dampener that looks like fuel pressure regulator by the fuel rail but its actually located in the fuel pump assembly. what year and motor is in your truck?

30th t/a

iTrader: (51)

Its a 2001 Silverado 4.8

fst100

iTrader: (5)

^ok. did a few googling and it looked like in 2004 was when they moved it into the fuel pump assembly. so I imagine you changed the fpr already?
https://www.silveradosierra.com/vort...or-t18146.html

30th t/a

iTrader: (51)

No I havent yet. I was told to pull the rubber line off of it and if there is gas in it then it needs to be replaced but mine did not have any gas in it.
my mechanic said he also checked it out as well so we did not replace it.

Id the fuel pressure starts acting up again that will be the first thing I replace but this is day five now and the truck is running great