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Old 09-11-2006, 09:00 AM   #1
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2003 Mustang GT stock fuel pressure?

Can someone please tell me what the stock fuel pressure is on a 2003 Mustang GT?
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Old 09-11-2006, 09:12 AM   #2
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With the vacuum hose attached at idle 35 to 50 psi.
With the vacuum hose detached 45 to 55 psi.
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Old 09-11-2006, 09:32 AM   #3
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That's a wide range. Any idea what it should be for bone stock?
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Old 09-11-2006, 10:42 AM   #4
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'bout 45 psi. What's yours?
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Old 09-11-2006, 03:04 PM   #5
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I have a fox that I will be using '03 injectors in (the pink top ones). Supposedly they are rated 22lb/hr at about 44 psi. I know stock fp on a fox is 39 psi but I don't know what stock is on an '03. I need a little larger injector than 19's for my combo but 24's are too much. I know I could just boost the fp on my stockers, but I wanted to experiment with these slightly larger injectors and keep the fp closer to stock.
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Old 09-11-2006, 03:24 PM   #6
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I see, I thought all the 2V 4.6 mustangs used 19lb injectors. I know that the colors meant less in the later years. You might want to check the part number and make sure those are 21lb injectors. Be that as it may, the answer to your question is Bosch (and Ford) rate the flow of their injectors at 3 bar or 43.5 PSI.
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Old 09-11-2006, 06:14 PM   #7
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Quote:
Originally Posted by chopper1
With the vacuum hose attached at idle 35 to 50 psi.
With the vacuum hose detached 45 to 55 psi.

Chopper is right, remember this is not going to be a constant pressure this is not a return fuel system and psi will vary at load levels on the vehicle, you are going to see lower psi at idle than on acceleration from a returnless system.
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Old 09-12-2006, 10:03 AM   #8
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Cool, thanks for the info guys.
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Old 09-12-2006, 04:15 PM   #9
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yikes, what a strange post.

fuel pressure should be no higher than 39 psi on a naturally aspirated stock motor.

depending on vac, the pressure should fluctuate between 27 and 39.

formula is 39-(vac/2)= rail pressure
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Old 09-13-2006, 01:17 AM   #10
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I don't have a clue, but i do have a question. My 98 has a return style fuel system you know the one with the pressure reg. built into the pass. side fuel rail. Anyway the fuel pressure on the return style system is always the same, so it doesn't fluctuate between #'s? thaks
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