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Old 08-31-2006, 8:26 PM   #1
Jorge68
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How to check fuel pressure??

Can someone help me and tell me how you go about checking the fuel pressure? I really need to check this to fix my car!! Let me know!
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Old 08-31-2006, 9:46 PM   #2
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why do you think you need to test this to fix your car?
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Old 09-01-2006, 6:18 AM   #3
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Because I need to figure out if it's my fuel pump/fuel lines, or my injectors.
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Old 09-01-2006, 8:34 AM   #4
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fuel pressure gauge. I thought you already knew the fuel pressure?

Quote:
Originally Posted by Jorge68
When they checked the fuel pressure..it was about 10psi. I checked the lines and the gas is coming out fine. I'm guessing it's the injector. Does anyboy know how to clean them?
If you test it again and its still low it wont be the injectors. They are the last spot the fuel goes thru.

Get a fuel pressure gauge and put it on the fuel rail
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Old 09-01-2006, 8:55 AM   #5
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Quote:
Originally Posted by fsttyms1
fuel pressure gauge. I thought you already knew the fuel pressure?



If you test it again and its still low it wont be the injectors. They are the last spot the fuel goes thru.

Get a fuel pressure gauge and put it on the fuel rail
Exactly..I need to retest it since I changed out the fuel pump and it didn't help any.
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Old 09-01-2006, 9:02 AM   #6
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Did you find out what the PSI is suppose to be?
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Old 09-01-2006, 9:46 AM   #7
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Quote:
Originally Posted by optomos
Did you find out what the PSI is suppose to be?
I don't have a manual - but my best guess would be 30-50 psi (leaning towards 40-50psi). I know it can vary based on intake vacuum and rpm.
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Old 09-01-2006, 10:05 AM   #8
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Quote:
Originally Posted by fla-tls
I don't have a manual - but my best guess would be 30-50 psi (leaning towards 40-50psi). I know it can vary based on intake vacuum and rpm.
This is acurate. Usually fuel pressure is anywhere from 35 to 55 on most cars. If he is only getting 10 psi, there is an issue somewhere in the fuel system, and is not an injector problem.
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Old 09-01-2006, 11:38 AM   #9
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Quote:
Originally Posted by TNelson
This is acurate. Usually fuel pressure is anywhere from 35 to 55 on most cars. If he is only getting 10 psi, there is an issue somewhere in the fuel system, and is not an injector problem.
That's what i'm trying to figure out. It could be clogged lines because of the stuff in my gas tank.
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Old 09-01-2006, 2:56 PM   #10
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Quote:
Originally Posted by Jorge68
That's what i'm trying to figure out. It could be clogged lines because of the stuff in my gas tank.
After you find out what the PSI is. You also have to do a voume test assuming the PSI is correct. you'll have to get a manual for the specs. You should call your central library ask if they have automotive manuals. Mitchell Manuals are real good on info. Good Luck!!
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Old 09-01-2006, 3:03 PM   #11
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Quote:
Originally Posted by Jorge68
That's what i'm trying to figure out. It could be clogged lines because of the stuff in my gas tank.
You can get a fuel presure gauge at most auto parts stores.
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Old 09-01-2006, 4:52 PM   #12
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sorry for the large size but this may help

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Old 09-01-2006, 10:09 PM   #13
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Jorge,

Did you only change the fuel pump? Did you backflush the main pressure line?

If your pressure is low, I would suspect you can pinch the return line to check the pressure regulator. Also, when you pull the vacuum line from the regulator, if you find any fuel on that side of regulator, you are suffering from a torn diaphram.

If your pressure is still low after changing the pump and blocking the regulator return, I would suspect clogged fuel line. I could suggest a couple of ways to clean out the sediment, but they all involve flushing the line with flammable liquids;-). Or a really long pipe cleaner.
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Old 09-07-2006, 5:00 PM   #14
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it says I need a special part (adapter) to check the pressure. Where can I get that??
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Old 09-10-2006, 7:40 PM   #15
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anybody??
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Old 09-10-2006, 9:31 PM   #16
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I have no idea? Search google maybe? it has to be out there.
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Old 09-10-2006, 9:31 PM
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