I ran my chev. 1990 pickup out of oil and now it smokes so bad. and i think my fuel pump is going out but not sure??

injectors
faulty turbo or internal crack
low cylinder compression
valve leakage
egr valve blocked or blanked off


also check ..
fuel pump pressure fuel filter
if hard starting cold ..glow plugs

IF the "check engine" or "service engine soon" light is on. You can take it to most any auto parts store to get the codes read.

Better yet would be to find someone with an actual scanning tool to see what all of the sensors are reading.

IF there is no check engine or service engine soon light on then it could be quite a few different things wrong.

A plugged catalytic converter is a possibility. Another item that i ran across on 3 different vehicles within a day was a bad coolant temperature sensor. All 3 vehicles ran fine when 1st started, but then slowly started to "load up" or run rich. REAL rich.

Turned out on all 3 vehicles there was NO check engine/service engine soon light but after hooking up the scanning tool all 3 showed the coolant temp sensor was reading -40°!!

Yup, the computer was being told the engine was at 40 BELOW zero. The computer took that info and adjusted the fuel/air mixture and timing to help the engine warm up.

While the engine warmed up, the sensor kept saying it was 40 below and made the engine run rich.

This MAY be the problem, but without a scan tool it's hard to say.

Hope this helps.

Only Ford products have a fuel switch called an inertia switch.
GM products use a fuel pump relay and the oil pressure switch to provide power to the pump.

Sounds like it might be a bad fuel pump, check fuel pressure should be 2.8-4.3 psi

blown head gasket an the white smoke is the truck burning off the antifreeze thats leaking into oil big job to repair 1500$at a cheaper shop...bad to run without fixing due to antifreeze thins oil and internal damage to engine will result....thanks for using fix ya.good luck friend never ran gas a diesel will not run on gas and will shut down almost imeditely if clean diesel is dirtied in any way...

check your fuel regulator

On the v-6 engines the oil pressure switch feeds the fuel pump. I'm not sure about your 1500. You didn't say what engine you have, so I will assume it is a v8. The oil pressure switch should be behind the distributor, near the firewall. You can use a paperclip as a jumper in the electrical connector that goes to the oil pressure switch. If it's the switch or low oil pressure, the jumper should complete the circuit and energize the fuel pump.

I think that could be your valves, or piston rings. when they get old and worn, oil can get past them, and then the oil burns (along with the fuel), making the smoke coming out of your exhaust. I'v has some car which smoked VERY badly, and I tried a additive called "restore" (that have it walmart, and other auto stores for about $6-$7 in a silver can). After about 400-500, it really helped. But I think it will only help if the problem is your piston rings (and not your valves). If the problem is your rings, the "restore" will also make the rings seal better, and it can improve fuel economy while doing do (giving your engine more compression=runs better=uses less fuel. I cant promise it will solve your problem, but IF your rings are the problem, then you would be luck, because that stuff has done miracle cures for me on the past.

Black usually indicates ground make sure you scape the frame very good before attaching.

Sounds like the Fuel Pump Relay is going Bad. If not you may need a New Fuel Pump.