PT Cruiser Forum  
Advertisements
       

Go Back   PT Cruiser Forum > General Forums > Tech & Performance Forum

PT Cruiser Forum

Advertisements
What's the minimum fuel pressure for car to run?

 
Reply
 
LinkBack Thread Tools Display Modes
  #1 (permalink)  
Old 27 Jul 2012, 10:10 am
Regular Cruiser
 
Join Date: Oct 2011
Posts: 115
Default What's the minimum fuel pressure for car to run?

Well, never have found out what is making my daughters 04 Cruiser stall. Have changed crank and cam sensor, plugs and wire and changed water pump and timing belt. It will just stall out of the blue O2 codes come on and then it will stall almost immediately. The only thing the mechanic could come up with is the fuel pressure fluctuates about 5 pounds. We just moved and was talking to a new neighbor that runs a machine shop and repairs cars also. He said they had a Chevy truck in that was stalling, he said the fuel pump was putting out what he thought was adequate pressure. But latter found out that there is a minimum for the engine to run.

Does anyone know what the minimum is for a Cruiser to run. I know that the pump puts out 58 psi, but what's the lowest it will run at?

Bob
Reply With Quote
  #2 (permalink)  
Old 27 Jul 2012, 11:40 am
NitroPT's Avatar
Obsessed Cruiser
 
Join Date: Jun 2012
Location: USA kalyfornia
Posts: 14,316
Default Re: What's the minimum fuel pressure for car to run?

Bob not sure what you are meaning? If you are @5-35psi total @ idle that is to low for good engine operation.
Fuel injectors universally need at least 39psi @ idle for best idle speed operation and should at least see aprox. +10psi.+/-5psi min. cruise rpm.
For most diagnostic checks of an EFI engine.
optimal psi NA 43psi+/10psi. Turbo or Super Charged 50psi+/10psi

There is also the flow rate which should be considered as well.
__________________

Dalai Lama
"Share you knowledge. It's the best way to achieve immortality."

Last edited by NitroPT; 27 Jul 2012 at 11:53 am. Reason: spacing
Reply With Quote
  #3 (permalink)  
Old 27 Jul 2012, 11:57 am
Regular Cruiser
 
Join Date: Oct 2011
Posts: 115
Default Re: What's the minimum fuel pressure for car to run?

NitroPT,

I've had three people say it was fuel related and the mechanic said he wouldn't rule out the fuel pump. I'm going to check with ORielley's to see if they have a fuel pressure tester that I can hook up while I drive it to see what's going on with it. When it quits, I know that the fuel pump comes on and then pressures up and then quits like normal. The mechanic said to pull the line and see if it's actually pumping gas when it quits and it does. But, once it quits it usually has to set a while before it will start. The last time it quit I was there and it started right back up, but was very rough running and took a couple minutes to even out.

Bob
Reply With Quote
  #4 (permalink)  
Old 27 Jul 2012, 01:47 pm
NitroPT's Avatar
Obsessed Cruiser
 
Join Date: Jun 2012
Location: USA kalyfornia
Posts: 14,316
Default Re: What's the minimum fuel pressure for car to run?

Quote:
Originally Posted by unioncreek View Post
NitroPT,

I've had three people say it was fuel related and the mechanic said he wouldn't rule out the fuel pump. I'm going to check with ORielley's to see if they have a fuel pressure tester that I can hook up while I drive it to see what's going on with it. When it quits, I know that the fuel pump comes on and then pressures up and then quits like normal. **The mechanic said to pull the line and see if it's actually pumping gas when it quits and it does. But, once it quits it usually has to set a while before it will start. The last time it quit I was there and it started right back up, but was very rough running and took a couple minutes to even out.

Bob
The number of people working on this issue means nothing if so many could not solve the problem!
And you say a mechanic is encluded with the other 3?
Anyway...............


Internet diagnosis: **it does not sound like a faulty fuel pump. However without at least checking line pressure it is only a guess on my part based on what you have posted so far.
BTW pulling the live pressurized fuel line without prior experience in doing a test like this really is not the safest method of testing an active fuel flow.

Your description of having to sit for a period of time relates to a cooling process. An electrical component such as a relay may be something to check out. Many relays are universal and can be temporarily swapped out for testing in another circuit. Be sure not to go to a higher number relay in the circuit you are testing.
__________________

Dalai Lama
"Share you knowledge. It's the best way to achieve immortality."

Last edited by NitroPT; 27 Jul 2012 at 01:49 pm. Reason: 1234
Reply With Quote
  #5 (permalink)  
Old 27 Jul 2012, 01:57 pm
Regular Cruiser
 
Join Date: Oct 2011
Posts: 115
Default Re: What's the minimum fuel pressure for car to run?

When I pulled the fuel line right after it quit I thought it would be pressurized from past experiences with other cars, but it was not. Fuel just dribbled out when I disconnected it. I then put the hose in a gas can and had my daughter turn the key on. Gas pumped out in force. I'm wondering it if could be related to the regulator.

I originally thought it was heat related, but when it started doing it two blocks from our house I ruled that out. It had sat at the least three hours each time then did it.

Bob

Last edited by unioncreek; 27 Jul 2012 at 02:00 pm.
Reply With Quote
  #6 (permalink)  
Old 27 Jul 2012, 04:40 pm
Senior Cruiser
 
Join Date: May 2012
Posts: 1,354
Default Re: What's the minimum fuel pressure for car to run?

If your injectors are clogged it could very much seem like a pump or filter issue, your getting good pressure until you get to the injectors, then they are weakly spraying the fuel into the combustion chamber. Have you tried replacing them? Or running a bottle of lucas through every gas tank?
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Clogged fuel filter, low fuel pressure or what? Gilgrin Tech & Performance Forum 8 01 Jun 2016 05:57 am
06 PT cranks but no fuel pressure PeteGossett Tech & Performance Forum 4 24 Apr 2011 03:41 pm
Fuel pressure regulator. Where it be at? Skye Tech & Performance Forum 3 23 Aug 2010 04:59 pm
Fuel Pressure Regulator PTcruzer02 General Turbo Discussions 11 09 Oct 2009 09:01 pm
Fuel pressure gauge PT GT Turbo Performance 1 14 Jun 2003 10:15 pm


All times are GMT -5. The time now is 06:51 pm.




Powered by vBulletin® Version 3.8.2
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
LinkBacks Enabled by vBSEO 3.6.0 PL2 © 2011, Crawlability, Inc.
vB.Sponsors