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Old 02-25-2011, 07:36 PM
tstevens tstevens is offline
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Default O1 Losing Fuel Pressure

Wondering if anyone has had this happen. My 01 Ranger starts hard and has been losing gas mileage. An initial look over by the mechanic found that after sitting for a while I'm losing fuel pressure and the hard start is caused by trying to build fuel pressure. They said its probably the fuel pump or a valve, but couldn't be sure unless they got in there checked.

I've put up with the hard start since last summer, but a can of Sea Foam improved it for a while.
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Old 02-25-2011, 09:39 PM
sgtsandman sgtsandman is offline
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Default Re: O1 Losing Fuel Pressure

I could be the fuel filter being partially clogged. Has it ever been changed?
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Old 02-26-2011, 12:27 AM
tstevens tstevens is offline
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Default Re: O1 Losing Fuel Pressure

Changed last May and went on a long road trip was getting great mileage. Toward the end of last summer the mileage started to peter off and was getting more hard starts.
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Old 02-26-2011, 02:09 AM
S13minus1 S13minus1 is offline
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Default Re: O1 Losing Fuel Pressure

most fuel pumps have a one way valve that prevents pressure bleed off while pump is not running. usually integral to the pump itself.
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Old 02-26-2011, 09:41 AM
sgtsandman sgtsandman is offline
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Default Re: O1 Losing Fuel Pressure

It sounds like the pump then. The only way to be sure is to hook a gauge up to the fuel rail and get a pressure reading. The other possibility is if there is a separate regulator in the fuel system but I'm not familiar enough with your set up to say if it is separate from the pump or not.
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