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Apr 30, 2010 | 10:33 PM

#16

j-bar

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Joined: Mar 2010

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pulled rail reploaced o ring and replaced o rings on all the injecters on that side. truck runs perfect put still no start when truck is hot when truck cools down it will start back.i need help.

Apr 30, 2010 | 10:48 PM

#17

j-bar

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replaced o ring on rail replaced o rings on all injecters on that bank and truck runs perfect but when hot it will not restart as soon as it cools off it will fire right back up.I NEED HELP.

May 1, 2010 | 04:53 AM

#18

Maxium4x4

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Joined: Jul 2004

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From: Ohio

Sounds like you have a leak at the high pressure pump.

May 1, 2010 | 07:17 AM

#19

j-bar

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How do i check for the leak at the pump.

May 1, 2010 | 08:33 AM

#20

npccpartsman

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Joined: Dec 2003

Posts: 15,368

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From: Stuttgart, Ar

Air pressure the HPO system via the IPR(?) sensor port in the passenger side front of the valve cover. If you hear a leak from either valve cover then the leak is (usually) under the valve cover. If you hear a leak from both sides it's usually at the pump. Use a piece of hose for a "stethoscope" to pinpoint closer.

Disclaimer: This is a general way to test but it works fairly well.

Here is some good advice/instruction when changing the STC fitting on the pump: https://www.ford-trucks.com/forums/952422-hpop.html