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A. Penland
A. Penland, Ford Senior Master Technician, ASE
Category: Ford
Satisfied Customers: 6206
Experience:  ASE Master Certified, ASE Advanced Gasoline Engine Performance
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MY 1999 ford F150 does not seem to be getting power to the

Customer Question

MY 1999 ford F150 does not seem to be getting power to the fuel pump. I have checked the button under the passenger kick panel and replaced the fuel pump. I also checked the fuse and switched the relay with another
Submitted: 1 year ago.
Category: Ford
Expert:  A. Penland replied 1 year ago.

What engine does the 1999 F150 have?

Customer: replied 1 year ago.
5.4 i have checked the button under the passenger kick panel, checked fuel pump relay fuse, switched out the relay with another, changed the fuel pump
Customer: replied 1 year ago.
Did you get that
Expert:  A. Penland replied 1 year ago.

Have you checked for power at the inertia switch under the passenger kick panel when you turn the key to on. You should have power on the DARK GREEN/YELLOW striped wire. Then check for power on the PINK/BLACK striped wire at the same switch turning the key to on.

You will only have power there for the first 3 to 5 seconds to prime the fuel system or constant power while cranking the engine.

Customer: replied 1 year ago.
I have not. I didn't really know how. I will try. How long can you wait
Expert:  A. Penland replied 1 year ago.

All you need is a meter that can measure DC voltage. Then, with the switch still plugged in, take the meter lead and try to push the point into the back side of the connector and touch the metal wire pin. Place the other meter lead on a good clean ground.

As for time, just reply back when you can on this post. I will be on line till 11 tonight, I am on the East Coast. Then tomorrow I have to work at my dealership, but I'll be home after 6:30 PM. I'll get an email when you reply back and I'll get back to you as soon as I can.

Customer: replied 1 year ago.
OK
Expert:  A. Penland replied 1 year ago.

I'm on here to help. Take your time and ask any questions necessary.

Customer: replied 1 year ago.
My lead on the multi meter was too big to get in there. I used a test light and both the green and pink flashed on briefly
Expert:  A. Penland replied 1 year ago.

Do they stay on when you are cranking the engine over?

Customer: replied 1 year ago.
well my mistake, i did not crank. I only turned the key on
Expert:  A. Penland replied 1 year ago.

There will be power for 3 to 5 seconds just turning the key on, constant while cranking.

Take your time.

Customer: replied 1 year ago.
Okay, it only flashed when i just turned key on. I will now go crank
Expert:  A. Penland replied 1 year ago.

Ok.

Customer: replied 1 year ago.
okay they both briefly light when key is on. But neither stay on when cranking
Expert:  A. Penland replied 1 year ago.

Ok. Remove the fuel pump relay and look on the bottom of it where the pins are at and see if it has numbers by the pins like 87 86 85 87A and 30.

Customer: replied 1 year ago.
it does
Expert:  A. Penland replied 1 year ago.

Ok. Leave the relay out and use a piece of wire or a paper clip and jump pins 30 and 87 and see if the engine runs.

Customer: replied 1 year ago.
Okay, i will be back
Expert:  A. Penland replied 1 year ago.

ok

Customer: replied 1 year ago.
it does not
Expert:  A. Penland replied 1 year ago.

Ok. Remove the jumper and check for power on pin 30 of the relay when you turn the key to on. See if you have constant power on brief power like at the inertia switch.

Customer: replied 1 year ago.
constant
Expert:  A. Penland replied 1 year ago.

Check the power on pin 86 and then check for a ground on pin 85 when turning the key to on.

Customer: replied 1 year ago.
how do i check for ground?
Customer: replied 1 year ago.
continuity?
Expert:  A. Penland replied 1 year ago.

Place one meter lead on the positive battery post and the other lead on the pin 85.

Customer: replied 1 year ago.
I do have power to 86, but it appears i have no ground to 85
Expert:  A. Penland replied 1 year ago.

Ok. The PCM (Engine Computer) supplies the ground to the fuel pump relay.

Have you been able to get any trouble codes from the PCM?

Customer: replied 1 year ago.
I have not tried today. I do not have a code reader here at home
Expert:  A. Penland replied 1 year ago.

Some auto parts stores loan or rent them out.

Customer: replied 1 year ago.
Okay, all it shows is a P0705 trans sensor
Expert:  A. Penland replied 1 year ago.

That is for the transmission range sensor. That sensor tells the PCM what gear the transmission is shifted into.

Customer: replied 1 year ago.
Okay, what do you think from here?
Expert:  A. Penland replied 1 year ago.

Clear the code. Then move the shifter through all the gears while you try to start the truck and see if the code returns.

Customer: replied 1 year ago.
Okay
Expert:  A. Penland replied 1 year ago.

keep me informed.

Customer: replied 1 year ago.
I erased the code and tried to start in all the gears. It has not came back yet
Expert:  A. Penland replied 1 year ago.

Does the check engine light come on when the key is turned on and go out when the engine is cranking over?

Customer: replied 1 year ago.
it is on when the key is on, and it goes out when cranking
Expert:  A. Penland replied 1 year ago.

Ok. We need to check continuity between pin 85 and the PCM connector pin #80. Below is a pin out for the PCM connector. Do it with the battery disconnected and the PCM disconnected.

Customer: replied 1 year ago.
I dont know where the pcm is. is both 80 and 85 on the pcm
Expert:  A. Penland replied 1 year ago.

Pin 85 is the ground in the fuel pump relay and pin #80 is in the PCM. The PCM is located on the passenger side of the firewall behind the right front fender well under the hood. It has a 10 mm bolt in the center of the connector.

Customer: replied 1 year ago.
am i checking the part tht stays on the firewall or the part i pull away
Customer: replied 1 year ago.
are you still there ?
Expert:  A. Penland replied 1 year ago.

Sorry, had to walk my dogs.

The wiring connector that pulls away from the PCM.

Customer: replied 1 year ago.
okay there is continuity
Expert:  A. Penland replied 1 year ago.

Ok. One last test. Put everything back together and use a section of wire and connect one end to a good clean ground and take the other end and attach it to pin 85 in the fuel pump relay and reinstall the relay. Then see if the engine starts. You may have to cycle the key a couple of times to get fuel back to the engine.

Customer: replied 1 year ago.
still did not start
Expert:  A. Penland replied 1 year ago.

Check and see if you have constant power at the inertia switch while cranking with that wire still in place.

Customer: replied 1 year ago.
is there any way to reconnect with you tomorrow? I dont have anyone to crank while i am checking the power
Expert:  A. Penland replied 1 year ago.

I'll be at work at my dealership tomorrow, but I'll be home after 6:30 PM tomorrow. I am on the East Coast.

Customer: replied 1 year ago.
do i have to repay
Expert:  A. Penland replied 1 year ago.

No, just reply back on this posting. We can talk back and forth till we fix your problem or you are satisfied.

Customer: replied 1 year ago.
can i log out and then back in to reconnect tomorrow?
Expert:  A. Penland replied 1 year ago.

Yes.

Customer: replied 1 year ago.
okay, i did as you asked. grounded a wire connected it to pin 85 and then put the relay back in. It did act as if it wanted to start but did not. So i checked and yes the test light showed constant power to the inertia switch on both the green and pink. i tried to clean and tighten several ground wires. I disconnected the jumper wire that we created, and i am still getting constant power to the inertia but still wont start
Expert:  A. Penland replied 1 year ago.

Check for fuel pressure at the test port on the fuel injector rail on the passenger side of the intake halfway back. You should get a large spray of fuel if you do not have a fuel pressure tester gauge.

Customer: replied 1 year ago.
do i have to have the key on or anything when testing?
Expert:  A. Penland replied 1 year ago.

Yes, turn the key on when you check the fuel pressure.

Customer: replied 1 year ago.
I tried to push it down with i little screw driver. It didnt seem to have any pressure
Expert:  A. Penland replied 1 year ago.

The fuel pump you replaced, was it just the electrical pump motor or was it the complete fuel pump assembly?

Customer: replied 1 year ago.
Just the electrical pump
Customer: replied 1 year ago.
but it was not starting before i replaced it either
Expert:  A. Penland replied 1 year ago.

You could have a bad pump. I do not recommend replacing just the pump motor. You should replace the complete assembly. Airtex makes a replacement pump that any auto parts store should carry.

Expert:  A. Penland replied 1 year ago.

Check and make sure you are getting power to the fuel pump first. You will have to go to the connector for the fuel pump and check or pressure there.

Customer: replied 1 year ago.
there are two fuel lines. how do i know which one or how to check pressure? also is there a way to make sure there is power to the pump?
Expert:  A. Penland replied 1 year ago.

One line is pressure and the other line is the return line to the fuel tank.

You can check the fuel pressure at the fuel filter or follow the line from the fuel filter back to the pump.

To check for power at the pump, check for power on the PINK/BLACK striped wire.

Customer: replied 1 year ago.
disconnected the fuel filter and no pressure. It does not appear there is any power either
Expert:  A. Penland replied 1 year ago.

Check continuity between the inertia switch Pink wire and the fuel pump connector pink wire.

Customer: replied 1 year ago.
i do have continuity from the inertia to the plug in at the pump
Expert:  A. Penland replied 1 year ago.

Are you still getting power at the inertia switch?

Customer: replied 1 year ago.
on both pink and green. Pretty much need to pull the pump again?
Expert:  A. Penland replied 1 year ago.

If you are getting power to the pump, and no fuel pressure, then the pump is the problem.

Customer: replied 1 year ago.
Okay i will pull the pump tomorrow. What days are you on this week?
Expert:  A. Penland replied 1 year ago.

I am on in the evening after 6:30 PM after I get home from work.

Customer: replied 1 year ago.
Okay, i will be back in touch. Thank you!
Expert:  A. Penland replied 1 year ago.

Your welcome. Keep me informed.