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Old 12-04-2014, 06:39 PM   #1
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1988 Ford E350 Fuel issue?

I have a 1988 Ford E350 Class C with a Ford 460 EFI motor. The converter was stopped up when I first got it but I removed it and replaced with a pipe so it has been running pretty good since then. It has about 27,000 original miles and I have replaced the in tank fuel pump, fuel filter, added new plugs and spark plug wires, distributor cap and rotor. It has always gotten about 8-10 mpg. On my last trip it seemed to run fine (cruise at about 62) but the gas mileage has dropped to about 5-6. When I got home it runs great from idle to about mid range then it seems to start stumbling if I push the pedal to the floor. It still runs but doesn't seem to make any more power. It seems to be fine until you get on the gas hard. I checked the fuel pressure at the rail and it reads 32 at idle and if I rev it up high it stays steady at about 36 but the motor seems to start stumbling. The pressure doesn't lose any. Does this sound like a bad high pressure pump under the driver side or a bad ignition module? I haven't removed the filter to check it yet but it is fairly new.
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Zoom45
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Old 12-05-2014, 09:19 AM   #2
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If it had a cat, I assume it has an O2 sensor? Was it replaced?
What is the fuel pressure spec? 32/36 seems low, but I'm not familiar with the Ford EFI system. I've had 350 and 454 fuel injected GMs, and their spec is ~55psi at idle.
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