1989 Ford Bronco Fuel Pump relays

1989 FORD BRONCO

150,000 MILES • 6 CYL • 4WD • AUTOMATIC

MARRP

MEMBER
3 POSTS

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

Aug 25, 2009 at 9:39 AM

RASMATAZ

✓Experienced Mechanic
75,988 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

Aug 25, 2009 at 10:08 AM

MARRP

MEMBER
3 POSTS

[quote:9dea8dfadc="rasmataz"]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[/quote:9dea8dfadc]

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

Aug 25, 2009 at 11:09 AM

RASMATAZ