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James, Ford Technician
Category: Ford
Satisfied Customers: 3623
Experience:  Ford Senior Master Tech, Ford gas and diesel expert, ASE Certified
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My1999 F 250 7.3 will not stay running unless I relieve fuel

Customer Question

My1999 F 250 7.3 will not stay running unless I relieve fuel pressure from fuel filer housing drain then levels off an run great
Submitted: 1 year ago.
Category: Ford
Customer: replied 1 year ago.
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
Expert:  James replied 1 year ago.

Do you completely empty the fuel filter housing?

Customer: replied 1 year ago.
Not completely drain just open drain valve just a little an engine runs great fuel is draining or returning into fuel can
Expert:  James replied 1 year ago.

When you open the drain valve the fuel drains on the floor. The first thing I would do is replace the fuel filter first. When you open the drain valve does it act like there is air in the system?

Customer: replied 1 year ago.
No air in system an there is a new fuel filter in housing with drain valve closed it runs a though it's missing an sputtering but I open drain valve eninge runs great also replaced drain valve mechanism to make sure it's not sucking air
Expert:  James replied 1 year ago.

If it's idling rough when the valve is closed its likely bad injector O rings. I would test fuel pump pressure to make sure. Usually if the injector I rings go out opening the drain valve will make the vehicle run smooth for a short amount of time. This is a time consuming job so I recommend replacing all 8 o ring sets. Once you do this the vehicle will drive like its brand new.

Expert:  James replied 1 year ago.

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Customer: replied 1 year ago.
James when I pulled injectors right bank it's got diesel fuel all the way to top of hole pulled second injector it only went down a little there is to much fuel on that side
Expert:  James replied 1 year ago.

Is there fuel in the antifreeze?

Customer: replied 1 year ago.
Expert:  James replied 1 year ago.

The fluid can transfer when an injector is removed though the cylinder head. It usually leaks into the cylinder.