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Old 08-01-2007, 03:01 PM   #1 (permalink)
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fuel pressure question

I just installed a gauge on my fuel line to check pressure at the carb..It sits steady on 7 psi at idle and when revved up..My question is should it hold the pressure once the engine is shut off?...It sits there for maybe 10 seconds and then quickly drops to zero..I was also a little puzzled when I pulled the fuel filter out to check it this morning and the fuel line was totally empty after sitting over night..The fuel pump is a street/strip carter mechanical.
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Old 08-01-2007, 04:00 PM   #2 (permalink)
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Re: fuel pressure question

My Mechanical held fuel pressure for hours. My electric doesn't hold it at all when its off. So I'm not really answering your question but telling you what i had.
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Old 08-02-2007, 03:23 AM   #3 (permalink)
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Re: fuel pressure question

My Mechanical pump does not hold the pressure for more then a minute or two, as indicated by my gauge on the carb side of the regulator.
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Old 08-02-2007, 03:31 AM   #4 (permalink)
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Re: fuel pressure question

Quote:
Originally Posted by Mikes66 View Post
My Mechanical pump does not hold the pressure for more then a minute or two, as indicated by my gauge on the carb side of the regulator.
Same here. You can see the pressure slowly drop.
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Old 08-02-2007, 08:39 AM   #5 (permalink)
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Re: fuel pressure question

If your fuel line is DRY, then you might have a problem. Get a vented Fuel cap so the tank does not suck the fuel back out of the line...



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Old 08-02-2007, 10:04 AM   #6 (permalink)
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Re: fuel pressure question

What FE said. May need a vent or need to unclog the one you have.
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Old 08-02-2007, 05:12 PM   #7 (permalink)
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Re: fuel pressure question

If pressure comes up right away when starting and you dont have a starvation concern I would not worry about it. Even some modern cars with 60PSI systems wont hold pressure all the time and some do. If your cap is bad you will have a vacuum on it when removing it.
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