check engine ligth is on ,dianostic said problem with fuel cicuit was on 1994 GMC Jimmy

running fine the quit.wounld,nt start took shop two days and counld.nt figure out what the prolem they ran a new ground wire rrom fuel pump to new fuel relay,the car started and ran find,since then the check engine ligth stays on and saids ther a short in the fuel pump circuit,what could the proplem be?p.s. car has new pump and a new relay for fuel pump,they cut the ground wire from fuel punp and ran a new wire to the ground o th enew pump relay,has ew fuel filter.nobody seems to know what the problem is seening as the ligth is on still,the car runs but has a intermintent miss which it never had before,anybody have any suggestion?

Asked by for the 1994 GMC Jimmy
You need to track down the wiring diagram and check the grounds. We've seen this on older GMs and was in the harness and not the fuel pump module. Our shop in Vallejo could look at it for you if you can't find the necessary paperwork.
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