94 jimmy.. have replaced almost everything.. smells like gas inside..all gas lines replaced..was running alot better then couldn't get it started almost like it flooded..starter fine..replacedall fuel lines,plugs and wires,idle air control, rotor and cap,sensor thoddle,fuel pump,fuelpump, all filters,distrubitor

Try the fuel pressure regulator. Pull the vacuum line and if it smells of gas, replace the regulator.

Hi Jimmie:
Fouling usually is coming from oil getting into that cylinder. Possible source will be oil rings or bad valve guide/seal.
Have you checked the compression?

Best to track down the source of the gas smell. Don't need engine fires. Run it a bit until you smell the gas. then shut it down and use your finger tips to feel for leaks at all of the gas line fittings, especially on the pressure side of the fuel pump. Look for places where dirt has collected, or where the area is cleaner than that surrounding it. Dust will collect on a small amount of gas, and will be washed away by a bigger leak.


I like your comment, " The harder you run it, the better it runs".
I've a Chevy big block in a dump truck. The instructions should say, "Run it like you hate it". It likes it.

Cheers,
Ted

If egr valve is stuck open can cause raunchy smell from exhaust, hense high readings. usually this causes rough idle though.

First check fuel pressure and see if is to spec, some times the new pump is to much or not enough. Just double check they gave you the right part. make sure you hook every thing like it was so back track your work. Make sure your filter is on right seens you smell gas and all lines are right on

It will not hurt the engine as long as it is clean water, muddy water will clog everything. You must drain the system and flush all water out ASAP.

My Pontiac G5 Gt coupe did the same thing. There was a recall on the gas line and it was replaced.

Yup! Running it low on oil can definitely cause a "burnt metal smell". It can also totally destroy the engine before you can ever smell it.

It sounds like something that needs to be checked by a professional auto repair technician to me.

I assume that it is a 4.3. These engine are very notorious for have a bad plastic fuel line inside the throttle body. It may not smell because it is sealed inside the body. The plastic deteriorates and fails and causes extra fuel to be used. The lines were only available from dealerships last time I replaced the unit. It costs about $100 and takes about 3 hours to remove and replace. Good luck!

To check EGR valve, plug the vacuum hose to it, and it should not get hot anymore. It if does, it is leaking.
But gas smell is usually bad plug wire or plug.
With good insulation, remove one sparkplug wire at a time, to see if one has no effect. That is the target.

Sounds more like the TPS (Throttle Position Sensor). When the Catalytic Converter goes, usually will get other symptoms like lack of power, bad sulphur smell, & a lot of heat coming from under the truck and depending on where it's located, hot floorboards. If you go to a place like Autozone and get a free diagnostic test, the codes would give you a better idea where the problem lies. Best of luck.
Greg