20 Most Recent 2004 Ford Super Duty F 450 - Page 2 Questions & Answers

Check And See If The Fuse For The Insrument Cluster Has Not Blown Its In The Fuse Panel

dont know but local auto zone can tell you and even print you out a diagram at no cost to you.

Mercon SP

If thats a 6.0 look for a hole or tear in the turbo connections..Also look at the air cooler in the front they are bad about cracking..Get someone to put the vehicle in reverse and hold the brake and raise the engine up,,then listen for the leak..

pull the fuses one at a time. Start with fuses in battery box under hood. See owner manual for location of fuses.

It may be the evap system. Could be as simple as the gas cap. try taking the gas cap off and starting it. If it starts then its the gas cap causing a vacuum. if not, then it could be:

1. Fuel filter.

2. Fuel pump. undo the fuel pipe into the engine and check to see if fuel is being pumped. disconnect the coil lead so engine doesn't start. Be very careful and make sure you put a container to capture the fuel.

3. If fuel is being pumped, then it could be the purge valve and/or vapor cannister. If these are faulty, it could cause a vacuum and vapor lock.

frankly, the fuel system isn't something you want to mess with if you are not a qualified mechanic.

try these easy forms of diagnosis to see if the gas cap is causing a vacuum, or if your brave enough, try the to see if the fuel is being pumped into the engine.

Good luck