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Problem 1989 Ford F250 XLT Lariat 70000 original miles showing no oil pressure Have replaced the oil pump the oil gauge and tested it and the sending unit. Still no oil pressure. Can you help?
Wiki User
∙ 8y ago
When the oil pump was replaced, was the oil pickup tube cleaned also? Sometimes the tube and filter can get clogged like a brick.
Stang, yes the pick up tube was checked but appeared to be clear.
I found this on fordforums.com:
I'm not sure just when Ford went from a "real" oil pressure gauge to a idiot
light with an analog readout, but it probably was late 80s for the truck lines.
If there's a button type sender at the oil pressure output port, it's a fake
gauge that closes a switch around 7 psi and then reopens it at say, 5 psi. Put a
mechanical gauge on the oil pressure port and see if the readings are consistent
with the factory "gauge". If so, you have problems, ranging from a dirty sump
(oil pickup screen gets clogged) to worn main bearings or crankshaft. If not,
it's the gauge itself, the sender, or the sender wiring.
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Thank you, ever so much. I'll let you know the outcome.
Wiki User
∙ 8y ago
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