Fun repairs await me....
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Post Fiend
Joined: Jun 2004
Posts: 9,293
Likes: 10
From: Parker, CO
if its not the pump, or the filter. try checking the pressure spring and the seat. but it sounds like a pump to me lossing power for what ever reason. tap into the 12v supply for the pump and monitor it as the problem happens. cheap. easy. have you checked the pressure just cycling the key on and off. the pump truns for a few secs. see what the pressure does then.
And yeah I was going to try to monitor the voltage at the pump to see what was happening.
As for the cycling the key, I did that earlier today too. Everything was normal when I tried it. This problem just pops up whenever it feels like it.
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Post Fiend
Joined: Jun 2004
Posts: 9,293
Likes: 10
From: Parker, CO
Didn't think about that one..... Something to look at.
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Post Fiend
Joined: Jun 2004
Posts: 9,293
Likes: 10
From: Parker, CO
Pretty sure I can rig something up.
FTE Leadership Emeritus
Joined: May 2001
Posts: 13,653
Likes: 6
From: Cabot, Arkansas
I was just digging through the service manual.....I can't even find a reference for P1203. No diagnostic subroutines at all. 
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Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
Me too. Considering the in tank mods, the only other useful bit of information I could come up with was the check valves located in the heads at the fuel line. A bad check valve can cause a loss of pressure in one of the fuel rails.
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Post Fiend
Joined: Jun 2004
Posts: 9,293
Likes: 10
From: Parker, CO
FTE Leadership Emeritus
Joined: May 2001
Posts: 13,653
Likes: 6
From: Cabot, Arkansas
An electrical issue with a loss of fuel pressure might come from the injectors too.....maybe a buzz test?
There are all kinds of crazy codes in that manual that don't show up on the main page.....I'll keep digging.
There are all kinds of crazy codes in that manual that don't show up on the main page.....I'll keep digging.
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Post Fiend
Joined: Jun 2004
Posts: 9,293
Likes: 10
From: Parker, CO
Well, Kainers left me a message over on another forum. He had a fuel pump die on him, and the same code popped up when it happened. So I guess the code does exist, and it's in reference to the fuel pump.
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Post Fiend
Joined: Jun 2004
Posts: 9,293
Likes: 10
From: Parker, CO
Lead Driver
Joined: Jun 2007
Posts: 7,760
Likes: 27
From: Hampton, Maryland.
I have to think that there is a loose or chaffed wire somewhere Curtis. The fuel pump voltage must be jumping because of it. I also think as a second option, there could be some loose debris in the line somewhere that may be obstructing flow.