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Technicaldan, Technician
Category: Ford
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Experience:  Accredited
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My 2008 ford f550 start but cut off due to air in fuel

Customer Question

my 2008 ford f550 start but cut off due to air in fuel filter
JA: How many miles are on the car? How has your mileage been lately?
Customer: 146000 been park last four years just put another engine
JA: What is the model of your '144000 Ford?
Customer: f550 with a 6.4 engine
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: i have a shop work on a lot of 6.0 and 6.4 changed fuel pump fuel filter still get air in filter an fuel rail
JA: Anything else you think the mechanic should know?
Customer: would like to now whats the most likely cause
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the Ford Mechanic about your situation and then connect you two.
Submitted: 4 months ago.
Category: Ford
Expert:  Technicaldan replied 4 months ago.

Hello, I would be looking to check the condition of the fuel sender unit in the diesel tank, if the pick up is deteriorated and cracked, with a low enough fuel level, it will drag air into the system as it's sucking the diesel out of the tank.

I had a car that wouldn't run under half a tank due to issues with the pick up.

You could fill the tank to see if this eradicates the air, hence pointing to the pick up.

Next I would be looking to vacuum test the fuel lines from the sender unit to the engine to look for leaks, block the pipe at the pick up and apply vacuum at the filter connection using a mitty vac or similar.

If this comes back ok I would be vacuum testing the fuel filter and housing to check for leaks.

Next I would test the lines from the filter to the pump.

By this point I would expect you have found the issue.

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