I recently had a Jasper rebuilt engine installed in my Ford E150. Since than my check engine light keeps coming on and the computer is saying my cas air mix is “lean”. The instaler says i need a new fuel pump.
Another mechanic says it is more likely a vacuum problem.
I know it’s possible that the fuel pump is bad bur since this has just started since the install, I don’t believe it can be the fuel pump unless it’s just one hell of a coincidence.
Anyone have any thoughts?