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Author Topic: Fuel Pressure Question 89_Fakesnake ¯ Member # 1253 posted                                 After engine cut off - how long is pressure in the system supposed to remain? Is it normal for pressure to drop within minutes after the engine is stopped? Also does anyone know of some effective ways to test a stock pressure regulator(fox)? Thanks in advance all. -------------------- 1988 Thunderbird Turbo Coupe (for sale) 1972 F100 2007 GSXR 1000 Posts: 480 | From: Sacramento, CA | Registered: May 2002  |  : JohnB Tech Moderator Member # 969 posted                              It varies on the type of pump that's installed. Typically it "should" stay, but some aftermarket pumps bleed off within a few minutes. If you loose it automatically, the internal check valve on the pump is done. A way to check the regulator? Why a fuel pressure tester...of course! -------------------- 1965 Shelby Cobra 1993 Cobra 2012 F150 Raptor 2020 GT500 Posts: 6523 | From: Orlando FL/Redding CA | Registered: Mar 2002  |  : 89_Fakesnake ¯ Member # 1253 posted                                 At a stand still the pressure seems within range - and the car rev's with no problem at a stand still ( a little choppy but will at least get through the RPM range) but while driving it falls flat on it's face under WOT...pulled a code 94 and just trying to find some direction. Thanks John. -------------------- 1988 Thunderbird Turbo Coupe (for sale) 1972 F100 2007 GSXR 1000 Posts: 480 | From: Sacramento, CA | Registered: May 2002  |  : JohnB Tech Moderator Member # 969 posted                              Is this on the 5.0 or the mighty 4-banger? The 5.0 may be a old code from your AIR system issues...the 4cyl, the torque converter is on it's way out. -------------------- 1965 Shelby Cobra 1993 Cobra 2012 F150 Raptor 2020 GT500 Posts: 6523 | From: Orlando FL/Redding CA | Registered: Mar 2002  |  : 89_Fakesnake ¯ Member # 1253 posted                                 It's the 5.0 - I thought I might have had problems with the air solenoids bc one had a visible crack in it - but that turned out to not be the problem....after replacing the symptoms are still present. Under WOT this thing just falls flat on it's face....RPM's will not increase unless I slowly apply accelerator - then it drives semi-normal. -------------------- 1988 Thunderbird Turbo Coupe (for sale) 1972 F100 2007 GSXR 1000 Posts: 480 | From: Sacramento, CA | Registered: May 2002  |  : totalkaos92 ¯ Member # 5750 posted                              kinda having same prob. when you hit the gas does your fuel pressure drop? cause im looking for an answer too. Posts: 2175 | From: the bay area | Registered: Jun 2005  |  : Turbo 66 ¯ Member # 7378 posted                              you might want to check your MAF sensor i had a similar problem with mine. -------------------- 66 coupe Posts: 220 | From: san jose | Registered: Jan 2007  |  :

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