Question about 2004 Ford Super Duty F 450

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Ford F450 motorhome will not start

After sitting for more then 3 weeks with out starting my 2003/2004 F450, van chassis motorhome , it will not start. I checked the fuel reset it is depressed. I have noticed that it used to not start, after time, and then the next day it would. Like if it had vapor locked. Now it will not start it all. The last time I started was about 3 - 3 1/2 weeks ago. Any suggestions?

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  • hnreb Nov 10, 2008

    I have a 2001 V10 450 in a 28' Jayco with 19000 miles. The vehicle has been parked for a couple of months without starting. I have plenty of battery for what is required for cranking. The engine does not fire.



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2007 motor home ford v 8 class c will not start battry good fuses good starts with the silonoed but not egnishion

Posted on May 19, 2011

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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

Posted on Jul 25, 2009


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