1989 Ford F350 460 engine stalls

Tiny
OKGAT
  • MEMBER
  • 1989 FORD F-350
  • V8
  • 2WD
  • AUTOMATIC
  • 122,000 MILES
Good day,

I have a 1989 F-Super Duty with 460 fuel enjected engine. When I start the engine after sitting several houre, the engine will run for about 15-20 seconds (fairly well) and then stall out. If I try to restart the engine, it will not restart. If I start the engine after waiting several hours the engine will start, but when I press the pedal the engine will quit.

I have replaced the spark plugs, rotor, fuel pressure regulator and oil.

The truck has two gas tanks. My son took a guage to the fuel line on the rails off the primary tank and determined the fuel pressure coming from the fuel pump was about 10psi and according to what we were told should be 40 psi. The secondary tank was not tested because it had not fuel.

I later filled the second tank with about 5 gallones of fuel, but it still would not start.

It does not matter whether I am running off of the primary or secondary fuel tank, it will stall after about 15-20 seconds.

Thank you,

Rick.
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Wednesday, March 11th, 2009 AT 1:42 AM

5 Replies

Tiny
RASMATAZ
  • MEMBER
The fuel pressure should be 30-45psi-yours is on the low side and needs replacement.
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Wednesday, March 11th, 2009 AT 1:53 AM
Tiny
RASMATAZ
  • MEMBER
Do you hear the 2ndary fuel pump come On and did you check the fuel pressure to it

Do a voltage drop on the brown wire after it leaves the inertia switch to the pump and tell me how many volts available.

I'll be waiting
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Wednesday, March 11th, 2009 AT 4:00 PM
Tiny
OKGAT
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Since my last request, I have replaced the EGR valve, the coolant temp send unit and we have checked the voltage on the secondary fuel pump. The fuel pump voltage at the primary fuel tank was 3.96 volts and second fuel pump of the second fuel tank was.10.

Having replaced these items plus the other items listed earlier, we are still getting the same problem. That is, when the engine starts, it will run for about 30 seconds (at most) and then quit. If I try to restart it will not restart. If I wait a period of time and try again, it will restart.

With the new in-line high pressure fuel pump located on the rail, we are still getting about 10 psi, when it should be somewhere around 35-40 pounds.

As far as doing a voltage drop on the brown wire after it leave the inertia switch, would you please explain how to perform that task.

Thanks.
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Saturday, March 21st, 2009 AT 8:35 PM
Tiny
RASMATAZ
  • MEMBER
Check all injectors if its leaking could be it causing the pressure drop.
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Saturday, March 21st, 2009 AT 9:12 PM
Tiny
OKGAT
  • MEMBER
After many attempts at trying to figure out the problem, I finally, with your assitance was able to resolve the issue. It turned out to be the fuel reservoir that was giving many problems. Over the years, I guess the reservoir just finally gave out.

Thanks again.

Rick G.
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Wednesday, March 25th, 2009 AT 9:58 PM

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