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Juan Crespo
Juan Crespo, Tech Trainer
Category: Ford
Satisfied Customers: 1525
Experience:  A.S.E. Master Technician, Advanced Level, Emissions - Asian, Domestic, & European
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Ford f250 diesel won't start and rpm tack is moving when

Customer Question

ford f250 diesel won't start and rpm tack is moving when trying to start
JA: Have you checked the battery, particularly the terminal connections? Are they corroded?
Customer: yes they are clean the engine turns over. ran the truck two days ago
JA: What year is your F250?
Customer: 1999
JA: Are you fixing your F250 yourself? What have you tried so far?
Customer: I just tried starting it
JA: Anything else you want the mechanic to know before I connect you?
Customer: what to do
Submitted: 8 months ago.
Category: Ford
Expert:  Juan Crespo replied 8 months ago.

Hi there.

Are you fixing this issue yourself? If so, first thing to check is that the lift pump is filling up the fuel filter assembly. Is it?

Customer: replied 7 months ago.
it is full
Expert:  Juan Crespo replied 7 months ago.

Sorry for the delayed response - I'm usually online weekdays from 1 to 8 PM.

First, check 30A fuse F30 under the dash (see attached graphic). That is power to PCM and fuel heater, if fuel heater in bottom of filter shorts out, it blows that fuse and the engine won't start. If you find the fuse blown, replace the heater - you can unplug it and the engine will still start and run OK since it's only needed in the winter.

Next thing would be to check the Under Valve Cover Harness for any possible fraying and shorting, especially on the driver's side - could also be the connector under the valve cover not making a good connection.

Please let me know what you find.

Customer: replied 7 months ago.
okay, I will and than let you know what I find. I live in Hawaii.
Expert:  Juan Crespo replied 7 months ago.

... and I in the Dominican Republic. Ain't life good for us? :-)

Customer: replied 7 months ago.
Does truck coming Hawaii have engine heater other then the heater in the cabin. When you said to disconnect the heater which heater were you referring to.
Expert:  Juan Crespo replied 7 months ago.

I was referring to the fuel heater located in the lower part of the fuel filter assembly. Was fuse 30 blown?