1991 F150 5.0L The fuel pump relay will start clicking and the check engine light comes on instantly & the truck starts running real rough & will even stall. Could it be the fuel filter or the fuel pump relay?at least I think it is the fuel pump relay it is a little green square box under the hood by all the wiring on driver side.
SOURCE: 1991 F150 5.0L, The fuel pump relay clicking
check your relay and your fuel filter should be replaced every 30,000 miles
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