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  #1  
Old 07-31-2011, 04:21 PM
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Default '88 Fuel Pump Wiring

I was up in the hills a few weeks back, truck wouldn't start after being parked for the night. A couple guys pulled me up to the closest convenience store, thought I burned up the in tank fuel pump(it was three weeks old at that point) Hitched a ride back to town, bought another fuel pump, switched it out. Still wouldn't start. Ran a wire from the fuse block to the red wire on the fuel pump, it started right up, drove it home. I'd like to get it running non-jimmy rigged, any ideas whats broke?

1988 2.9 V6 Super 5 speed

Thanks in advance!
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  #2  
Old 07-31-2011, 05:21 PM
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Default Re: '88 Fuel Pump Wiring

Update: traced the wire from the external fuel pump to a connector in the engine bay, hooked up power, and it starts. That wire (white/black) goes to a large plug, hooked up power there, and it starts. The other side of the plug, the wire is a heavier gauge red and black, and it goes into the cab. Going to try and find out where that wire goes, hopefully leading to the broken part....
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  #3  
Old 08-01-2011, 08:21 AM
Psycho Pete
 
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Default Re: '88 Fuel Pump Wiring

Going into the cab, it is most likely going to the inertia switch. Check for the prime pulses when the key is on Run to the wire going into the inertia switch from the relay, it won't have constant power when the key is on Run. When you put the key on Run, the computer will prime the system by turning on the pump 2 times for about 1-2 sec each time. Could be a relay problem, or that the computer is not grounding the fuel pump relay also.
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1987 Ford Ranger Short Bed 5.0L/T-5 Project
1988 Ford Ranger Long Bed Parts Truck
1993 Ford Tempo 2.3L OHV HSC Auto - D/D Stock.
1999 Honda Accord VTEC Auto
2002 Dodge Caravan - 3.3L Auto
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  #4  
Old 08-19-2011, 04:57 PM
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Default Re: '88 Fuel Pump Wiring



This is the inertia switch, no? Any wiring diagrams? I assume I connect the test light to one of those wires to observe prime pulses?
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  #5  
Old 08-19-2011, 05:42 PM
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Default Re: '88 Fuel Pump Wiring

Disregard last post. Did a little more digging and found the Inertia Switch, with a hole in the side and a piece of plastic holding it closed. Fixed that, and checked for prime pulses with a test light. It performs like it should. Relay is new. I'm at a loss...
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  #6  
Old 08-20-2011, 12:25 PM
Psycho Pete
 
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Default Re: '88 Fuel Pump Wiring

did you check for the pulses after the inertia switch, or before?

If you have a 12 volt pulse at your inertia switch, and can run the pumps from the plug on the driver's side that goes to your fuel pumps, really sounds like the problem is between the inertia switch and that plug. Might be worth while to check for pulse at that plug. Sounds like you are real close.
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1987 Ford Ranger Short Bed 5.0L/T-5 Project
1988 Ford Ranger Long Bed Parts Truck
1993 Ford Tempo 2.3L OHV HSC Auto - D/D Stock.
1999 Honda Accord VTEC Auto
2002 Dodge Caravan - 3.3L Auto
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  #7  
Old 08-23-2011, 09:15 PM
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Default Re: '88 Fuel Pump Wiring

I put a paperclip in one side of the inertia switch plug to clip to and the test light probe in the other side. The white wire with black stripe that I've been using to run power to the external fuel pump ends at a plug, engine side of the firewall. It's a pink with black stripe wire on the other side of the plug that runs into the cab. It appears to run in the main wiring loom up and over the steering column and ends at a six prong plug that consists of the pink/black, black, TWO brown/white, and TWO solid red wires. It wasn't connected to anything when I unwrapped the wires. It's a mess and I feel like I'm looking in the wrong place.
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  #8  
Old 08-24-2011, 04:48 PM
Psycho Pete
 
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Default Re: '88 Fuel Pump Wiring

It could be. There's a portion of the PK/BK wire the runs to a connector near the blower motor that is N.C. - not connected. I did a little digging lol as much as I could stand, but couldn't pin point that exact connector. It would be nice to build a database of all of the wire colors, and all of the splices/connectors to bring everything together, but that's just too much work. Could just query the wire colors and look to see what the most common connector was. There are also parts of the door lock circuits that are PK/BK.

Think you need an EVTM to sort it out, it's hard to put all of this together with out being there.

Or what I would probably do is put a grommet in the firewall on the drivers side and simply run a wire from one side of the inertia switch to the plug on the driver's side that goes to the pumps if you have power there.
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1987 Ford Ranger Short Bed 5.0L/T-5 Project
1988 Ford Ranger Long Bed Parts Truck
1993 Ford Tempo 2.3L OHV HSC Auto - D/D Stock.
1999 Honda Accord VTEC Auto
2002 Dodge Caravan - 3.3L Auto
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