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  #1  
Old 02-19-2010, 05:51 AM
modelageek modelageek is offline
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Default Fuel Pressure Test (help analyze my results)

Please analyze my test results. I changed my filter this morning. It was very dirty. Then I took the truck to AZ and borrowed/loan a fuel pressure tester. It took 8 cycles of the key to get the koeo pressure from 0 to 62. I then started it koer pressure 64. I turned it off pressure went back to 62. I let it sit 6 minutes pressure went down to 54( I had the gauge on finger tight with no teflon). So what do you think how long do I have on the pump?. Should it takes 8 cycles to build up to 62?
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2004 Ext Cab, 4WD, 4.0, Auto, 154k. (4.0 engine is out of a 2009 Ranger w/96k) ( as of 7/1/2017)

2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).
1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD).
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  #2  
Old 02-19-2010, 06:06 AM
rwenzing rwenzing is offline
Some assembly required...
 
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Quote:
Originally Posted by modelageek View Post
Should it takes 8 cycles to build up to 62?
No way. A healthy fuel system comes up to or near full operating pressure on the first cycle.
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  #3  
Old 02-19-2010, 06:11 AM
modelageek modelageek is offline
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so what could be my issue. is it the regulator?. the pump? is there any check valve that could be sticking?
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2004 Ext Cab, 4WD, 4.0, Auto, 154k. (4.0 engine is out of a 2009 Ranger w/96k) ( as of 7/1/2017)

2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).
1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD).
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  #4  
Old 02-19-2010, 10:47 AM
rwenzing rwenzing is offline
Some assembly required...
 
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It seems that the regulator is working because the pressure goes to 64 PSI when running - exactly where it should be.

A bad check valve usually leaks down very quickly when the key is turned off and yours does not. Even with a bad check valve, the pressure should not take several cycles to come up to spec. Ford says that the fuel pressure should not drop more than 5 PSI within the first minute after shutdown - anything close to that should be OK.

I'd have to guess that your problem is in the intank assembly. The strainer sock could be clogged but I think it is more likely that the fuel pump is just getting tired.
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2003 FX4 Level II, Supercharged 5.0L V8, Headers, Duals
BW4406 manual transfer case, Aussie Locker, Torsen L/S, 4.10's
Bilstein 7100 rezzies, Cadillac/Mustang rear discs, Duff traction bars
Keypad Entry, Lock LEDs, ABS switch, sway bar discos
Heated seats, Explorer EATC, Trip Computer and consoles

2003 XLT 2.3L M5OD-R1 reg cab, 2011 Taurus SEL, 2016 C-MAX Energi Plug-in Hybrid
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  #5  
Old 02-19-2010, 05:51 PM
modelageek modelageek is offline
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Quote:
Originally Posted by rwenzing View Post
It seems that the regulator is working because the pressure goes to 64 PSI when running - exactly where it should be.

A bad check valve usually leaks down very quickly when the key is turned off and yours does not. Even with a bad check valve, the pressure should not take several cycles to come up to spec. Ford says that the fuel pressure should not drop more than 5 PSI within the first minute after shutdown - anything close to that should be OK.

I'd have to guess that your problem is in the intank assembly. The strainer sock could be clogged but I think it is more likely that the fuel pump is just getting tired.
I am thinking of dropping the tank and replacing the strainer. I think you might be right though. the pump might just be getting tired especially after the filter was so clogged.
Anyone else with suggestions please keep the coming
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2004 Ext Cab, 4WD, 4.0, Auto, 154k. (4.0 engine is out of a 2009 Ranger w/96k) ( as of 7/1/2017)

2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).
1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD).
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  #6  
Old 02-22-2010, 12:28 PM
modelageek modelageek is offline
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I just tested it again and koeo 62. it went rught up there with one cycle. koer 64. I guess the new filter some injector cleaner and driving it cleaned it up. I bought a new stariner for the pump and i will put that on in a few months when i take the bed off for some other work...thanks for your input
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2004 Ext Cab, 4WD, 4.0, Auto, 154k. (4.0 engine is out of a 2009 Ranger w/96k) ( as of 7/1/2017)

2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).
1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD).
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