1999 Ford F-150 fuel pump

Tiny
CMRICE7@MCHSI.COM
  • MEMBER
  • 1999 FORD F-150
  • V8
  • 2WD
  • AUTOMATIC
  • 175,000 MILES
I stopped at a red light and the truck cut off. I figured out the fuel pump wasn't working. I replaced it and still nothing. I checked the voltage going to the pump and only have 0.05. I have checked the reset switch
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Tuesday, May 18th, 2010 AT 7:37 PM

28 Replies

Tiny
BMRFIXIT
  • EXPERT
Check fuel pump relay and wiring back to the fuel pump
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Tuesday, May 18th, 2010 AT 8:22 PM
Tiny
CMRICE7@MCHSI.COM
  • MEMBER
I can feel the relay tick but it only sends 0.05 volts to the pump
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Tuesday, May 18th, 2010 AT 8:26 PM
Tiny
BMRFIXIT
  • EXPERT
Are you testing the volts at the relay or at the pump?
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Tuesday, May 18th, 2010 AT 8:29 PM
Tiny
CMRICE7@MCHSI.COM
  • MEMBER
At the pump. I dont know how to check the relay
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Tuesday, May 18th, 2010 AT 9:06 PM
Tiny
BMRFIXIT
  • EXPERT
Mark the relay and switch it with a similar one
test at the relay for volts out
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Tuesday, May 18th, 2010 AT 9:52 PM
Tiny
BMRFIXIT
  • EXPERT
Check fuse #10 its 20A
pink/black wire should have battery volts when key 1st on and when cranking
if not go back to the inertia switch if have it power at the switch then suspect and check wire between switch and pump

if no volts check for volts at the grn/yel wire
if have power replace switch
if no power check wire between switch and relay
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Tuesday, May 18th, 2010 AT 10:10 PM
Tiny
CMRICE7@MCHSI.COM
  • MEMBER
There is no power on pnk/blk wire or grn/ylw wire

i swaped relays and it didn't change anything

i dont know what else to do
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Wednesday, May 19th, 2010 AT 8:32 PM
Tiny
BMRFIXIT
  • EXPERT
Checked the fuse and its OK?

Remove the relay and check cavity #30 should have battery power if so use a fused wire and jump cavity #30 to cavity #87 DR/GRN/YEL wire
that should activate the pump if wiring and circuit OK if not have to check by the spare tire for a module and if have one check for power in and out
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Wednesday, May 19th, 2010 AT 9:02 PM
Tiny
CMRICE7@MCHSI.COM
  • MEMBER
The fuse is ok.

I have checked the #30 and it does have power but havn't went any further. I will use a fused jumper and try that to 87 tomorrow. I'll let you know what I find. You have been so helpful. I just want to say thank you
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Wednesday, May 19th, 2010 AT 9:35 PM
Tiny
CMRICE7@MCHSI.COM
  • MEMBER
That will activate the pump even if the key is off or on?
If that does it means the relay is bad?
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Wednesday, May 19th, 2010 AT 9:41 PM
Tiny
CMRICE7@MCHSI.COM
  • MEMBER
There is a big round cylinder with fuel lines hooked to it but I have never noticed one before and have no clue as to what it is or does
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Wednesday, May 19th, 2010 AT 9:43 PM
Tiny
BMRFIXIT
  • EXPERT
Use a fused wire to power cavity #87
that should activate the pump on or off
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Wednesday, May 19th, 2010 AT 9:57 PM
Tiny
CMRICE7@MCHSI.COM
  • MEMBER
Ok I used a fused jumper wire from cavity #30 to #87 and it did activate the fuel pump.
What do I do now?
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Thursday, May 20th, 2010 AT 8:44 PM
Tiny
BMRFIXIT
  • EXPERT
Did you try new relay
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Thursday, May 20th, 2010 AT 9:29 PM
Tiny
CMRICE7@MCHSI.COM
  • MEMBER
No. I did swap relays but it didnt change anything.
Should I buy a new relay and install it?
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Thursday, May 20th, 2010 AT 9:33 PM
Tiny
BMRFIXIT
  • EXPERT
Use a test light
turn key on check cavite #86 it should have power do you?
Red wire
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Thursday, May 20th, 2010 AT 9:36 PM
Tiny
CMRICE7@MCHSI.COM
  • MEMBER
I will check tomorrow and let you know.
Will it only have power when the pump should be running?
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Thursday, May 20th, 2010 AT 9:57 PM
Tiny
BMRFIXIT
  • EXPERT
Jumping 30 to 87 should get the truck starter
if pump coming on all wiring should be fine from the relay to pump
have to check relay control circuit
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Thursday, May 20th, 2010 AT 10:01 PM
Tiny
CMRICE7@MCHSI.COM
  • MEMBER
I dont have power to cavity #86.
What next?
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Friday, May 21st, 2010 AT 6:27 PM
Tiny
BMRFIXIT
  • EXPERT
RED WIRE SHOULD HAVE POWER
CHECK FUSE #18 IT 15A UNDER HOOD FUSE BOX
LEFT SIDE OF ENGINE COMPARTMENT
IF FUSE OK CHECK WIRE
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Friday, May 21st, 2010 AT 7:01 PM

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