Engine Mechanical problem
1998 Chevy Cheyenne V8 Four Wheel Drive Automatic 186000 miles
I have a 98 Chevy Cheyenne 5.7L 4x4 1ton. This truck has ran great for years and all maintnance has been kept. About a year ago, I got a small leak in the tank. I patched it, cleaned out the tank, and put it back together again. I drove it around for about two weeks and parked it for about a week. Upon attempting to start it, it would just crank and cough. I changed the fuel filter, thinking I might not have got everything out of the tank. I drove it about two more weeks and parked it again for about a week. It would not fire when I started it again. Changed the fuel pump again and it started. This happened about two more times. While driving it down the road it lost all power and died. As I cranked it, it would attempt to cough at me but not fire. I put a new battery, checked all grounds and changed the fuel pump after I discovered the fuel pump was not working properly. After changing the fuel pump, it just coughs at me. I know this dang thing wants to start but cant seem to get there. Where should I go from here? Fuel PSI is good, spark looks to be there. I dont know what to do. The mileage seems to be high but I dont know if this is the original motor. It has been taken on several 8-10 hours road trips and does not burn oil. Well it really does not now since its broke down in front of my house. Any and all ideas would be greatly appreciated. By the way, im not getting any check ingine light or bad codes.
Are you installing a oem fuel pump or aftermarket? I have run into alot of trouble with aftermarket pumps. Its usually not the fuel pressure that causes it so much as the fuel volume.
August, 27, 2010 AT 8:44 PM
Yes it was the OEM fuel pump, dang thing ran me over 300 dollars : ) Where do u think I should start looking now. Everything just seems odd with this truck. It went from running GREAT to a junker in a matter of days and I just dont understand it.
August, 28, 2010 AT 8:49 PM
Have you tested the fuel pressure regualtor? Using a small vacuum pump you can see if its leaking down causing fuel to return back to tank. You may need to install a fuel pressure gauge and an inline spark tester to determine which is causing the concern.