Modular 4.6L Tech For all your 1996-2005+ 2V, 3V, and 4V modular motor needs.

Fuel Pressure trouble

  #1  
Old 04-22-2010, 07:29 PM
2001 gt stroker
Thread Starter
Join Date: Mar 2009
Location: Greenville Ohio
Posts: 122
Question Fuel Pressure trouble

I have a 01 mustang with the 5.0 stroker kit. I was going the the track last week and had to wait in line down the road at the track to get in. We were waiting with slow movement for 20min. As i got to the gate, i noticed my fuel pressure gauge showed 60psi and was holding steady. Usually the car runs at 38-40 at idle and lower rpms. The fuel pressure dropped to 20 and the car started sputtering. I pulled through and shut the car down. I opened the hood and everything seems warm even though my engine temp gauge shows normal. Everything fuel related was too hot to touch. I was wondering if anyone was having trouble with the fuel boiling and going into some kind of vaporlock. After i let the car set for an hour, started it up and pressure was perfect. I made two nitrous runs and went the 45min homes with no signs of trouble, but temp was 15degrees cooler. I have drove it around town since then and no trouble. Tonight i was about to the track and i noticed my gauge was close to 50 and holding. I ended up not running, but when we went to leave my pressure was back to normal. Any ideas what this could be or how to fix it. Thanks
 

Last edited by Graderbird2004; 04-24-2010 at 07:54 AM.
  #2  
Old 04-22-2010, 07:33 PM
Senior Member
Join Date: Nov 2004
Location: Pinole, Ca
Posts: 3,842
Default

You running a BAP? aftermarket fuel pump?


Tell us what kind of fuel system you have.
 
  #3  
Old 04-22-2010, 08:36 PM
2001 gt stroker
Thread Starter
Join Date: Mar 2009
Location: Greenville Ohio
Posts: 122
Default

sorry..i should have put that in posting. I have a svt focus 255lph intank fuel pump and 24lb injectors. Everything else on the fuel setup is stock.
 

Last edited by Graderbird2004; 04-24-2010 at 07:55 AM.
  #4  
Old 04-23-2010, 06:49 AM
2001 gt stroker
Thread Starter
Join Date: Mar 2009
Location: Greenville Ohio
Posts: 122
Default

i thought about cutting the vents in my cobra r hood to allow the engine compartment to breathe. Also i wonder if i can insulate around the regulater to keep it from getting heat soaked.
 
  #5  
Old 04-24-2010, 07:55 AM
2001 gt stroker
Thread Starter
Join Date: Mar 2009
Location: Greenville Ohio
Posts: 122
Default

any ideas?
 
  #6  
Old 04-24-2010, 02:21 PM
spike_africa's Avatar
Administrator
Join Date: Sep 2004
Location: Orlando,Florida
Posts: 11,974
Default

Your not going to vapor lock EFI. But 60psi at idle is way to high. Something is not right at all. Mine idles with 20-23psi at idle with a focus pump. I wonder if your fuel pressure sensor is going out.
 
  #7  
Old 04-24-2010, 02:33 PM
Senior Member
Join Date: Nov 2004
Location: Pinole, Ca
Posts: 3,842
Default

I dont know what it could be. The Fuel Pump Driver could be causing some amperage issues. If the FPS is starting to go south the car would practically be crippled.
 
  #8  
Old 04-24-2010, 09:58 PM
2001 gt stroker
Thread Starter
Join Date: Mar 2009
Location: Greenville Ohio
Posts: 122
Default

the car only acts up on very hot days and after driving for a long period of time. I have drove it over an hour last night and was quite a bit cooler, and no troubles at all. Seems like it has to be sunny, somewhere like 75and above and i have to drive it for a while. (car is all black so soaks up sun heat quickly.)
 
  #9  
Old 05-02-2010, 10:23 PM
2001 gt stroker
Thread Starter
Join Date: Mar 2009
Location: Greenville Ohio
Posts: 122
Default

today i drove the car on cooler weather and drove it for 20 min and the pressure started to rise. It stayed at 50. I stopped at the bank and when i starting driving throgh town, it went close to 60. I drove it home and on the way it started to go back down and evened out at 50psi. I let the car cool down for a few and come out later and the pressure will be back to normal 38.
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
haloallstar
Modular 4.6L Tech
9
01-30-2007 11:03 AM
96gtstang
Modular 4.6L Tech
1
01-11-2007 05:54 AM
bigbadtalontsi
5.0L Tech
0
12-28-2006 03:49 PM
smokinit2
5.0L Tech
6
07-11-2005 11:45 AM
GTmustang04
The Lounge
2
06-26-2005 03:49 AM


Thread Tools
Search this Thread
Quick Reply: Fuel Pressure trouble


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.