Thread: Engine Swap - '92 5.0EFI/AOD into '66 Ford F100....

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Ok, I just read on a Mustang site that the fuel needs to go directly to the injectors first and then pass thru the FPR on it's way to the return line. I'll switch the lines back the way I had them before....

Originally Posted by randyr

Ok, I just read on a Mustang site that the fuel needs to go directly to the injectors first and then pass thru the FPR on it's way to the return line. I'll switch the lines back the way I had them before....

Randy,
Sorry, I've been away from the discussion. Yes, the FPR modulates to control the amount of fuel returned to the tank, keeping the fuel rail pressure within control range. Fuel feeds the rail first, and the regulator is on the end of the rail where the return line connects.

Originally Posted by rspears

Randy,
Sorry, I've been away from the discussion. Yes, the FPR modulates to control the amount of fuel returned to the tank, keeping the fuel rail pressure within control range. Fuel feeds the rail first, and the regulator is on the end of the rail where the return line connects.

is it possible to have a faulty or blocked shrader valve? I appear to have good pressure up to the line connection below the shrader valve. Tomorrow I'll pull the section of line with the shrader and test it for blockage, etc. Beyond that, I'm kinda clueless at this point....

Originally Posted by randyr

is it possible to have a faulty or blocked shrader valve? I appear to have good pressure up to the line connection below the shrader valve. Tomorrow I'll pull the section of line with the shrader and test it for blockage, etc. Beyond that, I'm kinda clueless at this point....

I can't see how a schrader valve can block. They are just a form of valve port like your tire uses for air welded on the outer diameter of the fuel rail. When is the last time this engine ran? Did you hear it run before you bought the wrecked car? My son's Mustang had been sitting for a year or more, and we went through much of the same trying to get his going. Turned out that every injector was clogged with microscopic particles of rubber that the ethanol had attacked in the injectors themselves (and the in tank pump, too). He bought a rebuild kit and took them apart, carefully cleaned everything and reassembled them. Started on the first crank.

Originally Posted by rspears

I can't see how a schrader valve can block. They are just a form of valve port like your tire uses for air welded on the outer diameter of the fuel rail. When is the last time this engine ran? Did you hear it run before you bought the wrecked car? My son's Mustang had been sitting for a year or more, and we went through much of the same trying to get his going. Turned out that every injector was clogged with microscopic particles of rubber that the ethanol had attacked in the injectors themselves (and the in tank pump, too). He bought a rebuild kit and took them apart, carefully cleaned everything and reassembled them. Started on the first crank.

Thanks, Roger! It's been at least 10 months since the engine ran. When detailing the parts, I soaked the injectors in carb cleaner for a few days but had no way to really test them at the time. I installed new o-rings, end caps, etc, then masked them off and painted the "tan" portion silver. I suppose it's possible they could be clogged but I'm still surprised why my gauge shows no pressure at the shrader valve after changing the fuel pump when I seem to have great pressure to the connection just below it. Perhaps my gauge is faulty.

At any rate, I'm going to go thru those "no start" tests in the link I posted early to try to narrow down the problem. It's at this point that some would hang a "For Sale" sign on it.....but not me!!!!

Thanks so much for all your help!!!! and the rest of you guys, too!!!