onenastystang51

Ive got a 1988 f150 lariat dual tank 5.0 that i am having trouble finding the cause of no fuel to the engine. when i cycle engine u do not hear fuel pumps. i checked fuses and relays. saw that fuel pump relay was corroded so i replace relay and connector. but when i was replaceing that if i touched two wires together u can hear the high pressure pump run??? still nothing after. The guy i got if from def did not know what he was doing. Noticed i could not find the fuel tank selector switch. where is that located and to what plug? anbody got pic? any other suggestions.

onenastystang51

Hello? no help on here....

Aktech

Switch should have been on the dash. And what plug are you talking about? Jump pin 6 on the obd connector and see if you can hear the pump running. This is KOEO.

onenastystang51

Ok changed fuel pump relay and high pressure pump came on. also noticed the ground to the fuse box by batt was disconnected also. so in accesory mode u can hear pump but hasnt started yet. anyone know what color wires go where for the fuel pump relay???

Aktech

Pull codes.

5Rangers

onenastystang51

how do u pull the codes tried to find a sticky but didnt see one?? thanks for diagram

Aktech

https://www.f150forum.com/f10/how-re...es-obdi-10907/

onenastystang51

Ok guys got some info. replace all rear parts on rear tank. pump,tank,assy hose everything. tried to get codes couldnt really do it right. so i grounded fuel pumps and left it priming and truck cranked up but then cut off after 10 secs. i have 2 pictures of the fuel pump relay and the eec relay can u tell me if they are wired correct. cause im thinking its that or the high pressure pump????????? any thoughts thanks for all yalls help been frustrating with this thing....

onenastystang51