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fuel pump or regulator??

hekirk

New Member
Joined
June 13, 2004
Messages
6
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0
City, State
hephzibah,ga.
Year, Model & Trim Level
99 Sport 4x4
99 sohc won't allows start on first crank. sometimes takes 3or4 tries before it starts.
Start engine fuel pressure jumps straight to 65psi
fuel pressure at idle 65psi
engine stopped fuel pressure drops to 10psi in 1 minute and to 0psi in 2 minutes.

Is the regulator bad or the fuel pump check valve bad?

Thanks Gene
 




shamaal

Explorer Addict
Joined
April 25, 2005
Messages
1,248
Reaction score
5
City, State
Friensdwood, Texas
Year, Model & Trim Level
91 Mazda Navajo
I opt for Fuel Pressure Regulator. Fuel Specs from Haynes:

Fuel System Pressure at idle
Vaccum Hose Attached: 30-45 psi
Vacuum Hose Detached: 40-50 psi
Fuel System Hold Pressure (after 5 min): 30-40 psi
Fuel Pump Pressure (Max): 65 psi

Even if the check valve's bad, the fuel pressure regulator ain't regulating.
 




aldive

Elite In Memoriam
Joined
January 17, 2001
Messages
24,709
Reaction score
16
Year, Model & Trim Level
1999 XLT
My 99 SOHC does not have a FPR.

I once had similar symptoms with the fuel pressure and resolved it with a new fuel pump.

Good luck ......
 




shamaal

Explorer Addict
Joined
April 25, 2005
Messages
1,248
Reaction score
5
City, State
Friensdwood, Texas
Year, Model & Trim Level
91 Mazda Navajo
I guess that's another shortcoming for Haynes, it has 3 photos showing the FPRs on the OHV, the SOHC and the 5.0. :mad:
 




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