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02-19-2010, 05:51 AM
| | Ford Ranger Driver | | Join Date: Jan 2009
Posts: 1,254
| |  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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02-19-2010, 06:06 AM
|  | Some assembly required... | | Join Date: Jun 2009
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Quote:
Originally Posted by modelageek  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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02-19-2010, 06:11 AM
| | Ford Ranger Driver | | Join Date: Jan 2009
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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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02-19-2010, 10:47 AM
| | Some assembly required... | | Join Date: Jun 2009
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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.
__________________ 2003 FX4 Level II, Supercharged 5.0L V8, Headers, Duals
4R70W auto, BW4406 manual T/C, 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
Ford owners' manuals ONLINE, then click "Glovebox" |  | |  |
02-19-2010, 05:51 PM
| | Ford Ranger Driver | | Join Date: Jan 2009
Posts: 1,254
| |
Quote:
Originally Posted by rwenzing 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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02-22-2010, 12:28 PM
| | Ford Ranger Driver | | Join Date: Jan 2009
Posts: 1,254
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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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