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Testing the fuel pressure regular and fuel pump

 
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CaStylin
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PostPosted: Mon Oct 26, 2009 9:55 am    Post subject: Question Testing the fuel pressure regular and fuel pump Reply with quote

Basically I need to know if i can do and how to do a at home test on both the fuel pump and the FPR (fuel pressure regulator) and the fuel pump including

Back-story: When i went to get my A/C fixed i asked if he could see any reason way my fueling was off ... when i came back to pick the car up (meaning i did not see how he tested) he said he said my fuel line pressure was at 44 psi and it was supposed to be between 50 something and 60 something... he said it might be my pump but with the mods i had and with out further test which he couldn't do that day he couldn't be sure

Thanks for the help guys

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1968 Impala - 327 engine, more to come soon
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Frank
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PostPosted: Mon Oct 26, 2009 10:01 am    Post subject:   Reply with quote

You will need a fuel pressure gauge to test the fuel pressure and a handheld vacuum pump to test the FPR. I'm sick and going back to bed so I can't give you info on how to do it though. Sad

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CaStylin
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PostPosted: Tue Oct 27, 2009 1:05 pm    Post subject:   Reply with quote

i have a Slime digital pressure gauge so i should be able use that in the fuel pressure testing, where would i go about getting a hand held vaccum pump at?

Also could someone provide next steps please Laughing

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bbengineer
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PostPosted: Tue Oct 27, 2009 3:55 pm    Post subject:   Reply with quote

That's an air pressure gauge, not a fuel pressure gauge... you need a fuel pressure gauge

What you need to do is connect a FUEL pressure gauge and turn the key on (don't start). The pressure should be around mid 50psi. Then start the car and the pressure should drop 3-10psi

Not sure what the hand vac pump method is, but the method I described is from the service manual

BBEngineer

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zvm77
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PostPosted: Tue Oct 27, 2009 4:23 pm    Post subject:   Reply with quote

http://www.harborfreight.com/c.....mber=92699

http://www.autozone.com/autozo.....p-Sorensen

http://www.harborfreight.com/c.....mber=93547

(Not sure if the 3rd link is good for this)
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Frank
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PostPosted: Tue Oct 27, 2009 4:59 pm    Post subject:   Reply with quote

bbengineer wrote:
Not sure what the hand vac pump method is, but the method I described is from the service manual


It's to test the FPR. Smile

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CaStylin
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PostPosted: Tue Oct 27, 2009 5:02 pm    Post subject:   Reply with quote

bbengineer wrote:
That's an air pressure gauge, not a fuel pressure gauge... you need a fuel pressure gauge

My bad... as i didn't/don't know how to do this i thought i could use it Embarassed

bbengineer wrote:

What you need to do is connect a FUEL pressure gauge and turn the key on (don't start). The pressure should be around mid 50psi. Then start the car and the pressure should drop 3-10psi

The connection i am looking for is right to test fuel pressure is under the FPR or is it somewhere else Question


zvm77 wrote:
http://www.harborfreight.com/c.....mber=92699

http://www.autozone.com/autozo.....p-Sorensen

http://www.harborfreight.com/c.....mber=93547

(Not sure if the 3rd link is good for this)

I think i may just get a new FPR if its only $45 (i thought they were $80). they appear to be easy to install... correct me if I'm wrong
- 1. pop old C ring out
- 2. take old FRP out
- 3. insert new FRP
- 4. Insert new C ring

Anyone else know if the item in the third link will work for both vacuum and fuel pressure testing on the GM... it seems kinda weird that its Tests output pressure only goes to 10 PSI.. wouldn't i need reading higher then that

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Frank
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PostPosted: Tue Oct 27, 2009 7:16 pm    Post subject:   Reply with quote

The first one is what you will need.

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zvm77
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PostPosted: Tue Oct 27, 2009 7:20 pm    Post subject:   Reply with quote

it says it won't fit GM throttle body systems. Does that apply to us?
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PostPosted: Tue Oct 27, 2009 7:54 pm    Post subject:   Reply with quote

No...it refers to Throttle Body Injection.

http://autorepair.about.com/cs.....ef_791.htm

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