1999 7.3 fuel problems - Ford Powerstroke Diesel Forum
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Old 04-13-2014, 01:54 PM
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1999 7.3 fuel problems

I HAVE 1999 7.3 THAT HAS 375,OOO MILES ON IT. THIS TRUCK WAS USED IN A LOGGING OPERATION, SO HARD MILES. WHEN I FIRST BOUGHT THE TRUCK I CHANGED ALL FLUIDS AND FILTERS AND TRUCK RAN WELL. AFTER DRIVING ABOUT 2,000 MILES TRUCK WOULD ACT LIKE THE FUEL FILTER WAS CLOGGED. CHANGED THE FILTER AND DID NOT HELP. THEN CHANGED THE LIFT PUMP, STILL NO CHANGE. THEN DUMPED THE FUEL TANK AND GOT ALOT OF DIRT/DEB OUT AND REPLACED A BROKEN PICK UP SCREEN. THIS HELPED BUT TRUCK STILL ACTS UP ABOUT 50% OF THE TIME. WHAT ELSE CAN I DO TO CLEAN THE FUEL SYSTEM?
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Old 04-13-2014, 02:43 PM
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It Might not be your fuel system...could be your injectors...best thing to do is check fuel pressure with the port on the back side of the bowl.

Then, do a buzz test with a good scan tool. If it fails buzz test, then it's your injectors.

Check your high pressure oil pump, look at icp and duty cycle. That will tell you if it's weak

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Old 04-13-2014, 03:26 PM
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with all that crap you found, remove the "return" line off thebowl and with light compressed air, clear out the line.
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Old 04-13-2014, 05:37 PM
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Thanks to both of y'all I will try both ideas. Truck will idle and start normal, only when you start to go between 20 to 40 mph does it start to act like no fuel. If I put it in neutral and rev the motor it will temp fix the problem
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Old 04-13-2014, 07:29 PM
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Quote:
Originally Posted by madeline View Post
WHAT ELSE CAN I DO TO CLEAN THE FUEL SYSTEM?
do the 50 cent mod.

If planning on keeping ur for awhile, gauges wouldnt be a bad idea....egt, fuel, boost and trans
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Old 04-13-2014, 08:14 PM
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Quote:
Originally Posted by madeline View Post
Thanks to both of y'all I will try both ideas. Truck will idle and start normal, only when you start to go between 20 to 40 mph does it start to act like no fuel. If I put it in neutral and rev the motor it will temp fix the problem
You might can rev the motor, but that's not putting a load in the engine....

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