ltbenji
Well-Known Member
- Joined
- Jun 22, 2011
- Messages
- 89
- Vehicle Year
- 1988
- Transmission
- Manual
Hey Guys
Today ended day two of trying to diagnose my Ranger. I've extensively searched the forums but cannot find the information I need. Here's the story.
The truck is a 88 Ext Cab, single fuel tank, 89 engine and modified 88 wiring harness. 196k on the truck and about 60k on the engine. The swap was done over a year ago.
Last sunday the truck died in the road, started back up when a little gas was added, cut out again, waited a few hours and then ran for a final few minutes. It had to be towed home
Fuel pressure was tested when it was dropped off, first cycle nothing, eventually worked up to 40 but only after many cycles.
Fuses checked out fine and I replaced both relays.
Fuel pump - Autozone - Duralast 19911
EEC Relay - Advance Auto - BWD R3080
Nothing changed with the new relays and mixing and matching the new and old ones. Further investigation showed that the connectors were very corroded so $40 later the pigtails were replaced. Again the truck would't start.
My next thought was fuel pump(s). Almost 200k miles seems a good life. So off came the bed and the in tank pump and strainer assembly was replaced followed by the high pressure frame mounted pump as well as both filters.
Primed the system six or seven times and tried to crank it. The truck caught two or three times but would not run. It would choke out and eventually it would not start at all.
The current state is the fuel pumps will not even prime now. The relays both have at least one constant hot. No power is read at the inertia switch and bypassing the inertia switch doesn't help anything.
The wiring diagrams on the site have helped some but not tremendously. I've got a volt meter and have been chasing some wires but have not come to any solid conclusions.
What do I start with tomorrow?
Today ended day two of trying to diagnose my Ranger. I've extensively searched the forums but cannot find the information I need. Here's the story.
The truck is a 88 Ext Cab, single fuel tank, 89 engine and modified 88 wiring harness. 196k on the truck and about 60k on the engine. The swap was done over a year ago.
Last sunday the truck died in the road, started back up when a little gas was added, cut out again, waited a few hours and then ran for a final few minutes. It had to be towed home

Fuses checked out fine and I replaced both relays.
Fuel pump - Autozone - Duralast 19911
EEC Relay - Advance Auto - BWD R3080
Nothing changed with the new relays and mixing and matching the new and old ones. Further investigation showed that the connectors were very corroded so $40 later the pigtails were replaced. Again the truck would't start.
My next thought was fuel pump(s). Almost 200k miles seems a good life. So off came the bed and the in tank pump and strainer assembly was replaced followed by the high pressure frame mounted pump as well as both filters.
Primed the system six or seven times and tried to crank it. The truck caught two or three times but would not run. It would choke out and eventually it would not start at all.
The current state is the fuel pumps will not even prime now. The relays both have at least one constant hot. No power is read at the inertia switch and bypassing the inertia switch doesn't help anything.
The wiring diagrams on the site have helped some but not tremendously. I've got a volt meter and have been chasing some wires but have not come to any solid conclusions.
What do I start with tomorrow?