We have changed fuel pumps and even put in a new gas tank. At any given time, while driving along the engine will just quit and I need to get it off the road or towed back to my house. Any suggestions?
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Oh my! They are not a mechanic! You do not put flush in the gas tank, and you don't hollow out your your catalytic converter! Your oil pump is bad mate! you have to drop the oil pan, take off oil pump, inspect the oil pump drive shaft to make sure its not stripped (common problem) and prime the new pump, then install the new pump and pan. Add oil and you would have been good to go. Putting the flush in your gas caused your catalytic converter to go bad along with all your oxygen sensors, egr valve and everything that is a sensor for the exhause. Probably burned up your valves, which will require you to replace your heads, and probably left your cylinders in god awfull shape. WHOEVER TOLD YOU TO DO THIS HAS CAUSED YOU TO TOTALLY DESTROY YOUR ENGINE, AS WELL AS YOUR EMISSIONS CONTROL SYSTEM! I suggest you either install a new engine, along with all new emission control sensors and selinoids, or sell your car to a junkyard ($300 max is all they will usually pay) and buy another car. P.S. NEVER EVER TAKE THIS PERSONS ADVISE EVER AGAIN!
If the problem is the fuel pump, its not because someone put regular gas in the tank. The only problem that would cause is the computer would have to turn back the spark timing to keep the engine from knocking. You would check for spark to the plugs and fuel pressure as with any no start issue.
Clogged Catalytic Converter. What happens is as you push down harder on the accelerator you force more gas into the system causing a slightly richer mixture and more exhaust flow is neccessary. The easiest way to look for a clogged cat is when it's dark out take it for a ride causing it perform it's problem look under the vehicle if the cat is literally glowing red hot you either have a clogged cat or an extremely rich fuel mixture.
Sounds like the fuel pump is the most likely suspect. The fule filter could also play a role in preventing the fuel under pressure from reaching the engine going uphill. If you haven't changed the fuel filter recently, change it either way, then you can rule it out if the problem persists.