Fuel pump relay losses power to yellow wire
If you wired it yourself, note: yellow is a source wire in most wiring systems - red - direct power (battery/fuse box) - yellow, relay switch to part/component (i.e. fuel pump{electric}); then ground.
Ground, if self-wired, can be grounded to the frame,body, any metal.
If the wiring is not the issue, replace the fuel pump relay, if haven't already. If this is not the problem, or has been replaced already, you may need to replace the fuel pump. NOTE: If this is the Ford e F250,350 etc. it may have a secondary fuel pump which would be located on the driver side mounted to the frame just behind the engine. I owned a 90 F250, 2WD, and no such part was installed. At least not there.
I had a similar issue with my truck, would start, sometimes run for a while and die, would drive, then randomly die while driving -
Check the fusable link next to the battery and ensure it is securely locked together - it is a twist and pull mechanism (plastic). This was the issue with mine. I tore the front of my engine apart thinking it was a timing issue, just to find out 4-5 times of doing that, that it was the fusable link - i too, replaced the fuel pump relay, fuse etc. -- check this first as it may be the cause (if carburated, also check all your plugs, wires, cap and rotor - if not carburated, have the coil packs tested - NOTE: the modular (coil packs sit/bolt to this) cannot be tested - look for bubbles, or sign of "boiled" sections. If such marking exist, it needs replaced. Have the coil packs tested anyway just to be sure. If they all test positive, your good to go - if not, replace as need - (also be suire to mark each one in the order they come off ) this doesn't really make any difference when you put it back together, however, this will let you know, in the event the modular is good, (no boils or bubbles etc) ; you will be able to determine which side (if three, left,middle,right) was the bad coil pack. Mark each, from left to right, as 1,2,3, or A,B,C - or however you deem suitable. This will be useful for reference in possible future occurrances.
I hope this information is helpful and you get your vehicle running smoothly. I understand your frustration with this particular issue, as it took me 2-3 months before I realized that the fusable link was the issue - had spent 3-4 hundred dollars in parts ---
Please let me know if I can be of any further assistance. Thank you,
carsandcomps
Guru, fixya.com
thanks, I'll give it a try
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