Having problems with your 1988 Ford F 150 ?

I replaced the turn signal switch and now it wont start. i can hear the fuel pump kick on. makes no sense

\015 I replaced the turn signal switch on 1988 f150 and now it wont start. i have spark but fuel pump not running. the truck ran when i parked it to replace the switch. i also snugged up the bolts in the valve cover. checked around to be sure i didnt pull any wires off. theres a green wire hanging there but dont see where it goes. may have been that way when i bout the truck a few weeks ago.\015 Posted / edited by AnonymousUser on : 11-12-2017

Answers :

You said you hear the pump come on, then said fuel pump not running ???
Check the fuse for the pump, preferably with a test light to verify power is there. Key must be in on position. If the fuse is powered, feel for the fuel pump relay to click when you turn key to on. Put your finger on it while someone turns key to on. If it clicks, check for power at the tank connector on the pump wire, while the engine is cranked. If power there when cranking, the pump must have failed and needs replacing. If the relay clicked with key on, and no power at the pump wire at tank while cranking, then check wiring from relay to pump connector-the fuel wire may have broken.
If the relay doesn't click when key turned on, check for the power feed for the pump at the relay terminal. If the relay has power available to be transmitted to pump, then the relay's signal from the computer or the ground side of the relay's coil signal (from the computer) may need checked.
If the pump is working, and you have good pressure in the lines, check the injector circuit. Also a fused circuit, so check the fuse first. The injector should have a steady voltage signal to it with key on. The injector only has two wires, the power wire and the ground wire which goes to the computer. When the computer momentarily grounds the injector circuit, the injector "pulses", causing fuel to spray out the bottom.
Repair Help & Product Troubleshooting for 1988 Ford F 150

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