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  #1  
Old 05-28-2010, 01:50 PM
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Join Date: Jan 2009
Location: China Grove TX
Vehicle: 1998 Ford F 150
Posts: 33
Help Needed on 1999 5.4. Oil Sending Unit???

I am working on a 1999 F-250 with a 5.4 v8. Can anyone tell me where the oil sending unit is located? My brother in law paid some fly by night to replace his oil pump, which the fly by night said needed replacing. Well still having the low oil pressure/no oil pressure problem. I am going to hook up a manual oil pressure gauge and see what we have as far as oil pressure. Thanks. Chief Mike
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Old 05-29-2010, 02:56 AM
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Join Date: Jul 2004
Location: Easton, Pa.
Vehicle: 2002 F150 super crew
Posts: 5,026
Should find it right on the oil filter to block adapter.
It's only a switch that closes it's contacts when it detects about 8 psi of oil pressure.
Common problem.
The dash gage is not a true oil pressure indication of varying pressue but just goes to a mid position when the switch closes.
Sorry he got taken for big bucks in labor and the cost of a pump and gaskets.
This should have been replaced first, just on cost alone.
All you need to do is measure for a short with a meter when the motor is running. If it is open, it's faulty.
Good luck.

Last edited by Bluegrass; 05-29-2010 at 02:58 AM.
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  #3  
Old 05-29-2010, 08:00 AM
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Join Date: Jun 2009
Location: earth
Vehicle: 0002 fomoco 150
Posts: 478
Quote:
Originally Posted by Bluegrass View Post
It's only a switch that closes it's contacts when it detects about 8 psi of oil pressure.

The dash gage is not a true oil pressure indication of varying pressue but just goes to a mid position when the switch closes.
really? that seems quite lame...

8psi at idle maybe, but hardly appropriate for anything but.
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Old 05-29-2010, 01:55 PM
glc glc is offline
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Join Date: Dec 2006
Location: Joplin MO
Vehicle: 2003 Ford F150
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It's simply an idiot light that looks like a gauge.
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Old 05-29-2010, 01:55 PM


 
 
 
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