SPONSORED LINKS

1993 Ford F-150 F-150 Fuel Pumps will not engage

Tiny
FENR1S71
  • MEMBER
  • 1993 FORD F-150
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 28,000 MILES
The fuel pumps work fine if connected directly to the battery with jumpers to the sending units, but when in the tanks or otherwise connected through the wiring harness neither pump will engage. The EEC-IV self test code is # 542 "Fuel pump secondary circuit failure PCM to ground" according to the Chiltons manual for the truck. Also when testing the fuel tank selector switch the readings are incorrect. Where do I go from here other than trying to trace every possible wire for shorts?
SPONSORED LINKS
Saturday, January 2nd, 2010 AT 8:57 PM

3 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check and test the fuel pump fuses, fuel pump relay and inertia switch
Was this
answer
helpful?
Yes
No
+1
Saturday, January 2nd, 2010 AT 9:05 PM
Tiny
FENR1S71
  • MEMBER
  • 1 POST
Thanks but I did check them and all seem to be working correctly. Is there any other options?
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Saturday, January 2nd, 2010 AT 9:07 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Last option here is the computer control of the fuel pump relay
Was this
answer
helpful?
Yes
No
Saturday, January 2nd, 2010 AT 9:37 PM

Please login or register to post a reply.

Related Fuel System Fuel Pump Test Content

Fuel Pump Pressure Test
GUIDE
Fuel Pump Pressure Test
Your car's fuel pump is used to supply gas to the engine's fuel injectors weather it be gasoline or diesel fuels. Depending on the fuel system design you can have one or...
VIEW MORE

Sponsored links