Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
HelloCustomer I'm thinking it is likely more likely to be the fuel pump since both sides of the engine are producing lean but I think it is still worthwhile to check for a vacuum leak. Here are some things to do:
Check for vacuum leaks at the intake manifold, throttle body, and injector O-rings.
Basically if you notice your engine running a little bit of a high idle or rough idle it could be a vacuum leak and reply back to me if this is the problem. If you do not find anything in the vacuum area it likely needs a fuel pump, this requires removing the fuel tank underneath the car. This is quite a task without a hoist to lift the truck up and without a special jack to rest the tank on but if you would like the instructions on how to remove the tank, I can provide it to you.
need help on a 1999 Chevy K3500 pickup with a 7.4 L