Asked this question 100 times still no answer.

Gotta 99 silverado with a 4.3. The original fuel pump went out at 170k replaced it with the full airtex unit from advance. that only last 6 months. Then got another under warranty that only lasted 2 months and then another and it only last 3 months. Now have replaced it with a Gm pump and here it is 4 months later and its going out again. Truck has 183k on the clock.

Weird thing is none of the pumps die electronically they will just stop putting out pressure at high rpms then start getting into the lower rpms till the truck just wont even crank.

Why does this keep happening? Whats killing them? im tired of changing the pump every few months for the same thing to happen. The truck has had fuel filter changed with each pump.

I'd like to know to. I had a '94 went through over 10 of them in one year. after the third I cut a hole in the bed and fabricated a door. pita sorry I don't know the answer

my dad tells me not to drive my truck with less than a 1/4 tank of gas due to the gas kools the pump, and you might want to check all your grounds starting with the gas tank to frame, motor to frame,cab to frame, cab to motor. good luck hope it works.

I never let mine get under a 1/4 tank being I heard what Gladiator stated long ago. Mine hasnt went out so far.... Also try a Walbro 255 or other intank upgrade... I hear alot of good about them.

did you ever check your fuel filter? IMO I would try to find a restriction, or wire problem. Maybe the pump has a bad ground?

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Originally Posted by ff_jeff

did you ever check your fuel filter? IMO I would try to find a restriction, or wire problem. Maybe the pump has a bad ground?

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Check every wire and connection. My bet is there is a bad ground and the pump is shorting out.

Also make sure and empty the tank the next time you have the pump out. Check for silicate build up in the sump that clogs the internal filter. Had a rash of 03 Z engine utilities like this.

I changed the fuel filter with every new pump. Ive swapped gas tanks and cleaned this one i have now. ally my grounds are good except for the ground from the fill nozzle to frame is gone but that shouldnt affect the pump.

Also if the pump was shorting out wouldnt it stop turning on? All these pumps turn on but arent putting out enough pressure to fire the motor.

my suggestion would be put a frame mounted pump on there, then you wont have to do all that work to get at it. Did you check the fuel filter?

what you talkin bout ducky lol

airtex and all them after market pumps suck

I have no idea what I was saying. So I deleted it haha

So many times we have had people barf at the ACDelco price and buy the one from the parts store. No matter how much we warn them they usually come back within 6 months on the hook with no pressure.

I know you have used the ACD but I'm just throwing that out there.

Bad grounds wouldn't "short out" the pumps but they would keep them from running. Since your pumps are running but have lessened output they're either wearing out too quickly (fuel to blame) or there is a restriction somewhere in the system....even the FPR or return could cause a problem.

Are you sure the FPR is OK?

Never checked the FPR asked about it once never got a good answer. Would it be ideal to change? Anyway to go about checking it before getting a new one.

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Originally Posted by ff_jeff

did you ever check your fuel filter? IMO I would try to find a restriction, or wire problem. Maybe the pump has a bad ground?

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Quote:

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Originally Posted by GasGuzzler

...Bad grounds wouldn't "short out" the pumps but they would keep them from running. Since your pumps are running but have lessened output they're either wearing out too quickly (fuel to blame) or there is a restriction somewhere in the system....even the FPR or return could cause a problem.

Are you sure the FPR is OK?

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At least we are on the same page.

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Originally Posted by static99

Never checked the FPR asked about it once never got a good answer. Would it be ideal to change? Anyway to go about checking it before getting a new one.

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I would.
Start at the bottom and work your way up with fuel system problems.

The OP said he replaced the filter every time and it's not a ground so we're on the same page as far as some other restriction for sure. Something like a bum FPR or a pinched fuel line I guess.

Any links to a good one to buy? I dont want to get a crappy one from local parts store.

A good what to buy?

FPR. not a pinched line for sure. ive replaced those plastic lines also.

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Originally Posted by GasGuzzler

A good what to buy?

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FPR

Umm...GM...? Gotta pop the top on the 6 to replace it but I'd rather it be proven bad first.

Ok. where to buy gm one? and How do i test it first? I see in the haynes manual i gotta pull the intake manifold and spider assembly out to change the fpr. If the pump is still working now just starting to not have good pressure at certain rpms would changing the fpr make it run normal or is the pump ready to go to?

should be a vacuum line running to it. Pull it off. If there is gas in it...it's bad.

You have checked the grounds, but have you checked what voltage you're getting back @ the pump? I've seen relays build up corrosion and cause resistive contacts. That reduces the voltage and current going to the pump giving you lower fuel flow.

Also, ever since ROHS bs has come along all electronics have gone from lead/tin solder to silver. All the new relays and fuses are silver tinned, which means they tarnish over time. Check your fuses and relay leads for tarnish build up. Most of the time just rocking them in place will clear the connection.

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Originally Posted by oleshifty

should be a vacuum line running to it. Pull it off. If there is gas in it...it's bad.

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Well i have to pull the intake manifold off to check it so i might as well replace it while im in there.

Yeah no vacuum line on the V6.

so is there anyway to check it then?

With a gauge, a scanner, and shut off adapters.

So i might as well just pull it out and replace it. Or get a new motor since this one has 183k

Whatever man.

I meant i might as well pull the FPR out and replace it since i dont have all that stuff to check it right?

Or a new v8 lol