fuel pump

[chevy9]

I have a 1990 chevy c1500 with a 5.7 lt. It started running like crap and the service engine light came on. The codes were lean exhaust, egr valve and o2 sensor. I have replaced egr valve and solenoid, o2 sensor and map sensor. None of which made a difference. Now my fuel pump is out. Could that have been the problem the hole time? It was missing when it accelarated but ran smooth when at a steady speed and idled up and down

[consultIII]

yep. sounds like fuel starved symptoms. check fuel pressure cranking if it doesn't start...sorry don't have spec's for you...will try to get some tomorrow.

[MT-2500]

Originally Posted by chevy9

I have a 1990 chevy c1500 with a 5.7 lt. It started running like crap and the service engine light came on. The codes were lean exhaust, egr valve and o2 sensor. I have replaced egr valve and solenoid, o2 sensor and map sensor. None of which made a difference. Now my fuel pump is out. Could that have been the problem the hole time? It was missing when it accelarated but ran smooth when at a steady speed and idled up and down

Like they say codes do not say replace parts but check it out first.

Low fuel pressure almost always throw a lean exhaust code.
What was the code no?

[Chevy-SS]

I had similar problem on my 98 Silverado. It would sputter and die, but only under a load - such as climbing a long hill. Otherwise, it ran great. The truck gave out all kinds of different codes, and the dealership was originally stumped. They replaced cap and rotor, then I did wires, fuel filter, etc, etc.

My problem turned out to be the fuel pump. I had the pump replaced by a local shop. But they used a local brand, not OEM. That pump lasted about 2 months, then same sputtering started again. This time, I had the shop use OEM fuel pump and now all is well.

So, I would suggest that you be sure you have a OEM pump in there.

Good luck.

[gocougs]

I have 98 K1500 that showed the same problems during acceleration. I found the problem to be a plugged fuel filter, which was starving the engine at the higher flow rates. My pump never quite but it did make a loud whining noise until I replaced the filter.

I have a friend with a 96 K1500 that has gone through a couple fuel pumps. His factory pump quit after 160K and he replaced it with an aftermarket pump. That one quit after a few thousand miles. He's back to an OEM pump.

[j cAT]

Originally Posted by gocougs

I have 98 K1500 that showed the same problems during acceleration. I found the problem to be a plugged fuel filter, which was starving the engine at the higher flow rates. My pump never quite but it did make a loud whining noise until I replaced the filter.

I have a friend with a 96 K1500 that has gone through a couple fuel pumps. His factory pump quit after 160K and he replaced it with an aftermarket pump. That one quit after a few thousand miles. He's back to an OEM pump.

the reason there are many with these fuel pump problems are because GM does not give a replacement interval....most with few problems replace the filter at 30,ooo mi...the next reason is because of constantly running with low fuel ,,at / below 1/4 tank....This damages the pump with overheating ...with low fuel in the tank more crap enters the pump and plugs up filter etc....

with a good fuel pump, a restiction like a filter dirty will make the pump louder ..

whenever the pump is replaced replace the fuel pump relay ..A bad pump can damage the relay contacts !