1989 Ford Bronco Fuel Pump relays

Tiny
MARRP
  • MEMBER
  • 1989 FORD BRONCO
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 150,000 MILES
I have been able to get fuel pressure to the engine with the pumps using a bypass on the fuel pump relay but it will not start. When I hooked up a jumper to ground off of the fuel pump test connector on the ecu connector the truck fired up and ran just fine - disconnect the grounded connection and it will die immediately. This should have it narrowed down quite a bit, but I don't know where to look from here - relays are working and fuel pumps are working - this leaves some sort of fuel control that the ecu bypasses when bypassed
Tuesday, August 25th, 2009 AT 4:39 PM

5 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
When I hooked up a jumper to ground off of the fuel pump test connector on the ecu connector

Which pin out no. 8 or 22 either the coil side of the relay is not getting power or the relay is not being grounded by the computer
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Tuesday, August 25th, 2009 AT 5:08 PM
Tiny
MARRP
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  • 3 POSTS
I have 12 volts on one pin of relay at all times without bypass to fuel pump connected - when I turn on key, there is 12 volts to both sides of the relay from ECU and when I connect the bypass there is minimal voltage on one side and 12 volts to the other
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Tuesday, August 25th, 2009 AT 6:09 PM
Tiny
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  • MECHANIC
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Give me your email addy and I'll send you the electrical wiring diagram
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Tuesday, August 25th, 2009 AT 6:37 PM
Tiny
MARRP
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Marrp@comcast. Net
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Tuesday, August 25th, 2009 AT 9:10 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
I've sent it and good luck
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Wednesday, August 26th, 2009 AT 1:31 PM

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