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I have a1995 s10 with a 4.3 five speed non vortech. While on the highway the fuel gauge will jump way past full and die then go down back down and run fine then repeat again every few minutes.
Re: I have a1995 s10 with a 4.3 five speed non vortech....
The engine dies or the fuel gauge dies? has anyone replaced the fuel pump? maybe check the ground wire , its attached to the frame near the fuel filler inlet. (left rear wheel area)
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Do you gas them up at the same place ? May be contaminated fuel for them both to have the same issue . Alcohol/water contaminated fuel is a growing problem with ethanol.
Please check the following:
- Scan the system and read the live data.
- Fuel pump pressure. (38 - 44 psi).
- Fuel filter for clogged.
- Regulating valve.
- Non Return Valve for clogged, located at the top back of fuel tank on the chassis.
- MAP sensor.
It may also be the catalytic converter. If that gets plugged up it puts a lot of back pressure on the motor. This will make it hard to get up to speed. When not pressing much on the petal it will seem to run fine. Then when you press more to increase speed you will feel it.
fuel level sensor it will eventually set a check eng light. the unit is on top of the fuel pump assembly it is a little black sensor that can be changed by itself or if u wish a new pump assembly will fix it also.
First thing i would check would be the fuel filter. Sometimes, when they first start to give problems, there is enough gas to keep them idling or driving around town, but when you get on the highway they starve for fuel.
Shell has had issues with contaminated fuel in the past cant recall what it was but it actually damaged the fuel pump. I hope thats not the issue here can get costly in some cases fuel pumps on GM are a whole assembly. DOes the gas gauge still read properly? This was a big tell with the contamination last time. Gauge would read empty even when full.
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