FloydFlaymes
New Member
- Joined
- January 5, 2015
- Messages
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- Year, Model & Trim Level
- 99 Ford Explorer 4.0L XLT
Chasing a "cranks but won't start" problem, I think I found a short to ground between the fuel pump fuse and fuel pump relay.
The relay is fine and I get spark when cranking. The pump doesn't whir. I did not check pressure or fuel filter. Want to tackle the shorts first.
With the key off, battery connected, and fuse removed, I measure full battery voltage across the fuse terminals when I replace the fuse with my volt meter leads. There are actually a total of 7 fuses that have at least a few volts across the terminals.
With the positive battery cable disconnected, I measure 244 mA between the positive battery terminal and the cable clamp.
Also, with the battery disconnected, fuse removed, and relay removed, I get continuity with ground at the negative fuse socket and the fuel pump relay open position terminal that shouldn't be connected to anything at all (so I am guessing).
This is my first big electrical safari, so I have lots of questions.
What do I do next? Pull the power distribution box and try replacing wires?
Replace box?
Is there any chance the fuel pump is still OK? Replacing that pump is the last thing I want to do.
Help!
The relay is fine and I get spark when cranking. The pump doesn't whir. I did not check pressure or fuel filter. Want to tackle the shorts first.
With the key off, battery connected, and fuse removed, I measure full battery voltage across the fuse terminals when I replace the fuse with my volt meter leads. There are actually a total of 7 fuses that have at least a few volts across the terminals.
With the positive battery cable disconnected, I measure 244 mA between the positive battery terminal and the cable clamp.
Also, with the battery disconnected, fuse removed, and relay removed, I get continuity with ground at the negative fuse socket and the fuel pump relay open position terminal that shouldn't be connected to anything at all (so I am guessing).
This is my first big electrical safari, so I have lots of questions.
What do I do next? Pull the power distribution box and try replacing wires?
Replace box?
Is there any chance the fuel pump is still OK? Replacing that pump is the last thing I want to do.
Help!