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Unread 12-19-2008   #1 (permalink)
89 Ford HO is offline GT Member


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Default stock fuel pressure 1990 Mustang 5.0

whats stock fuel pressure in a 1990 5.o mustang
and is there any reason to have fuel pressure less than stock?
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Unread 12-19-2008   #2 (permalink)
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Carbureted Models - 6-8psi
Central Fuel Injection (CFI) - 39psi
EFI and SEFI Fuel Injection Systems - 30-45psi

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Unread 12-19-2008   #3 (permalink)
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Stock pressure is usually 39 psi. There's times that lower than stock pressure is good, a stock 5.0 tends to run slightly rich so a couple of psi lower would do some good. But the engine will dictate where the right pressure setting should be based on it's needs.
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Unread 12-19-2008   #4 (permalink)
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i set it at about 36ish which i had it at 30 and after i put it up i noticed that it felt better.like it had more low end torque from starting off
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Unread 12-23-2008   #5 (permalink)
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As Eagle said, lowering the pressure will lean out the mixture. It's just like putting smaller jets in a carb. Also, I agree that there are times to run lower than the spec'd pressure. For instance, my car has a Cobra intake and E303 cam, Edelbrock heads, etc. All the emission systems in place and working. Where I live, we must pass an annual emission inspection. For pre-96 cars, that's a visual for cats and a tailpipe sniffer check. My car won't pass with the tune set up that I normally run. Excess HC. To pass, I retard the timing back to the stock 10 degrees and reduce the fuel pressure to 34 - 35 from the 40 I normally run. Reducing the pressure leans the motor just enough to pass.
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Unread 12-23-2008   #6 (permalink)
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Hmmmmm..interesting post.
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Unread 12-23-2008   #7 (permalink)
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ya that's interesting but where im from i dont have to worrie about smog or anything.
i don't even have smog on my car anymore i also need to set my timing again
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Unread 12-23-2008   #8 (permalink)
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Ahh the good life here in Florida
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Unread 12-24-2008   #9 (permalink)
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ya florida is interesting lol.
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