How do you replace a fuel filter on 2008 f550?

Answer 1

very very good question its very tricky.

There are 2 fuel filters one is under the hood that is standing up and 2nd one is sideways under the vehicle right under the drivers seat.

1st. Clean out the inside of the main filter that is under driver side door clean it very well with a rag and then extra lube the o ring on the filter then lock the filter in and start screwing it in. make sure it fits perfectly and it on tight if not the vehicle will not prime.

2nd. When you install the other filter under the hood dont screw it on all the way leave it loose so the air can escape the lines

3rd. Turn the keys to on position then spiral thing pops up tells you to wait for spark plugs to warm up at the same time it primes the fuel lines too so turn it on wait till light go off, turn off the key and do it again about 5-12 times it can be as long as 2 trys if you did every thing perfectly and you will see or hear the diesel pooring out of the fuel filter under the hood.

4th Tighten the filter

5th turn key to on wait for light to go off and start while pumping gas pedal should start right up.

Very good question and have fun on your project.