fuel injector relay

[asavage]

Glad you found the problem.

My own fuel pump story follows:
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I've written this up several times over the years; strangely, I cannot find even one instance on the web via Google.

In 1981, I was working in fleet maintenance at a golf course, and we had a seasonal worker who began showing up late. He didn't live all that far away, but he said his truck kept dying on the commute. It was about a '66 Ford pickup, and it would just lose power and die. He'd coast off to the shoulder and try to restart it, but it would never restart unless he left it alone for ten minutes. He replaced lots of things (all the usual ignition stuff, the fuel pump, fuel filter, etc.) and he wanted to start replacing big stuff next (carburetor, etc.) and all the while he peppered me with questions, wanting suggestions. I was not really interested in repairing everyone's car, but I never mind sharing my opinion! Nothing helped.

After a couple of weeks of this, I finally agreed to look at it after work, and he arranged to leave it overnight. First things first: always verify the symptom, so I drove it until it died. Just as he described, and the power would drop off gradually, indicating to me that it was a fuel problem -- no surprise, but back in the era of points & condenser systems, something like 80% of all starting/driveability issues were ignition related. That figure changed radically after a decade of widespread adoption of electronic ignition systems.

Anyway, the PU wouldn't restart immediately, as described. I had brought a book. I waited ten minutes, and it fired back up without too much cranking.

For fuel delivery problems, I use the same method most every time. I teed into the pressure line off the fuel pump, got out my old Sears vacuum/pressure gauge (it was old then; it's positively ancient today) and duct-taped it to the windscreen, connected it to the tee. Drove the truck. This time, I could see the fuel pressure falling off long before the truck began losing power. OK, fuel delivery problem confirmed.

Already long story shortened: I removed the fuel sending unit, shined a flashlight into the fuel tank. There was the problem: a blue windscreen washing paper towel floating around in the tank. It would eventually float into the pickup tube screen and wrap itself around it, the vacuum of the fuel pump holding it in place. Engine dies, vacuum disappears, and the sloshing of the fuel in the tank would gradually work the paper towel loose so it could go play somewhere else.

Rinse, lather, repeat.

I fished the paper towel out with a length of welding wire -- grounded, of course, and non-sparking. Problem solved.
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[kassim503]

That, is the worst possible thing that can happen. I dont expect to see that problem on google ever!


unless google picks up nissandiesel.dydns.org