Fuel pump and sending unit having intermittent problems

Do you know if they also replaced the sending unit in the tank ?
It could also be a problem with the gauge on the dash.

Hey man if you already changed out the relay i would try changing your fuel pump and sending unit that should stop both of your problems.

Other than putting an oscilloscope on the
fuel pump ,all you can to is change it

They last from 4 years to 20 years

It is a very tiny motor
The brgs wear & the armature binds up, as
in your case & brushes also wear

Fuel Filter Removal & Installation To Remove:

1. Remove fuel tank.
2. Remove fuel pump/fuel gauge sending unit.
3. Remove fuel filter from fuel pump/fuel gauge sending unit.

To Install:

1. Install fuel filter to fuel pump/fuel gauge sending unit.
2. Install fuel pump/fuel gauge sending unit.
3. Install fuel tank.

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However, I would look at ignition or tune up issues rather than simply a fuel filter.

Find out what the engine problem is by having the engine's computer scanned through the OBD-II port.

There was an issue with the sending unit itself. There were 4 or 5 thin contact points on the sending unit. The new ones have 3 thicker contact points, they tend to last longer. As the contacts break off one by one the fuel gauge becomes intermittent and then nothing.

Hi: Sounds like the fuel pump/sending unit has a bad ground or the connector is corroded causing intermittant working. Check the plug on the fuel sending unit for corrosion and clean. I hope this can help you...Besides its free info!!

you need to replace the fuel sending unit in you gas tank, as well as fuel pump. you may find your problems there. unless there is an electrical malfuntion

try cleaning the connector that goes to the fuel pump, sometimes they corrode on inside. If that does not fix, test the wires feeding fuel pump with a multi meter until the condition shows itself again, if voltage drops to zero or very low then wiring problem, if voltage is unchanged with problem and fuel pump is not working and connectors are all clean, try replacement of fuel pump.

The live feed wire to the sender unit is earthing out intermittently to the car body. Check the wiring for any breakage in the insulation, probably local to the sending unit.

sound like a problem with your sending unit inside the gas tank with fuel pump or gauge in dash defective but with GM usually it is the sending unit