Why is the fuel pump not running at Key on?
Why is the fuel pump not running at Key on?
You are pretty certain the fuel pump (FP) is not running briefly at key-on, right? Try thumping on the tank a few times with something soft, like your hand; then try “key-on” and listen for the FP. If the thumping awakens the FP, then it is likely bad. The thumping jiggles worn motor brushes enough to renew contact, but only for a short while.
Can a 1999 Ford F-150 start but not start?
I have a 1999 Ford F-150 that cranks the engine but will not start. I last drove the truck home from a 18 mile trip and the truck exhibited no problems, the next morning the truck wouldn’t start.
How can I Trick my fuel pump into running?
To trick the fuel pump into running, find the ECC test connector and jump the connector in the upper RH corner to ground. If the fuse links are OK, you will have power to the pump. Check fuel pressure – core. Fuel should squirt out, catch it in a rag. A tire pressure gauge can also be used if you have one – look for 37-40 PSI.
Why does my F-150 start after rapping the tank?
Billr is right, if it starts after rapping the tank, it is a worn fuel pump. How many miles on that truck? Mine had 158K. You can bypass the f/p relay very easily with a jumper wire after pulling the relay out.That applies 12 directly to the pump. If you don’t hear it, then it’s the pump or the wiring to it.
You are pretty certain the fuel pump (FP) is not running briefly at key-on, right? Try thumping on the tank a few times with something soft, like your hand; then try “key-on” and listen for the FP. If the thumping awakens the FP, then it is likely bad. The thumping jiggles worn motor brushes enough to renew contact, but only for a short while.
I have a 1999 Ford F-150 that cranks the engine but will not start. I last drove the truck home from a 18 mile trip and the truck exhibited no problems, the next morning the truck wouldn’t start.
What are the relays in a 1999 Ford F-150?
AC Clutch Relay, Speed Control Module, Reverse Lamp, Climate Mode Switch, Daytime Running Lamp Relay Front Washer Pump Relay, Wiper Run/Park Relay, Wiper Hi/LO Relay, Windshield Wiper Motor
Billr is right, if it starts after rapping the tank, it is a worn fuel pump. How many miles on that truck? Mine had 158K. You can bypass the f/p relay very easily with a jumper wire after pulling the relay out.That applies 12 directly to the pump. If you don’t hear it, then it’s the pump or the wiring to it.
