Originally Posted by defender1844
Where is the fuel pump relay on a '97 and how would I test it? I don't hear the pump prime at all when I turn the key to the on position. It just all of a sudden stopped starting. There was no warning.
On a '97, the fuel pump relay is part of a mulitifunction unit. It is under the hood, underneath the white plastic cover on the passenger side P/N: YWB100820LG. They are not cheap - $99.95 thru AB.
Before you replace it: (assuming your battery is good and that the terminals/cable ends are clean...)
Did you check the fuel pump fuse?
Did you try and reset your inertia fuel switch? (Push the button).
If that doesn't work try, by-passing it with a paperclip in the plug end. (If still no start, you've at least likely eliminated the inertia switch as the culprit.)
Next, try lowering the tank just enough to get to the fuel pump connector. Disconnect the fuel pump harness plug and run test leads directly from the battery to the fuel pump. (The fuel pump power wire is white/purple. Look at how the plug is oriented and you can figure out which pin on the pump you want to hook up to, along with the ground, of course.) If it works, then you've (most likely) eliminated the pump as the problem.
It may then be a wiring issue: either a short, a ground problem, or the fuel pump wiring harness plug itself.
If it is the plug...
Defenders don't have a separate fuel pump wiring harness - but apparantly, early Discos do and they use the same fuel pump plug. When the fuel pump plug end went bad on my 97 SW, I bought a Disco harness part, P/N YMT10050 and bastardized it for the plug end. (Thanks to Mike @ Westchester LR for providing this valuable tid-bit of info...)