Originally Posted by custom_rider
Hello guys !
I have a '88 Chevy G20 Van with 350 TBI.
When i turn key to ON position i can hear fuel pump for 2 seconds.
When i try to crank, engine not start (fuel injectors pour some gas drop) but when i pour some gas into carb engine starts and running excellent for about 3-7 seconds, and then runs badly and i is idling i must kicking gas pedal to make engine runs, but when i pour again some gas to carb runs excellent. And one more thing - my oil pressure gauge is not moving (bad oil pressure sensor ??)
I would guess that either the filters need replacing or the pump is failing to provide sufficient pressure but runs or the regulator is bypassing too much fuel.
First place I go would be a fuel pressure test at the TBI's incoming pipe, it needs to be about 10 to 16 pounds per square inch. I strongly suspect you'll find the pressure low. Then comes finding out why. First thing would be to replace the in-line filters. Next would be the regulator, then would be the fuel intake filter and pump assembly. Getting this out is a hassle so just get a new pump and filter and replace it as it isn't much more effort than what ir takes to just look at the old one. You have to drop the fuel tank to do this. Dangerous work, you want it pretty empty and work with brass or copper tools a spark here will fry you.
If the engine currently runs but not well, I seriously doubt that the oil pressure sender is a fault in the fuel delivery system.