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Old 02-19-2018, 03:56 PM   #1
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Weird oil pressure issue

Fresh built 04.5 engine on start up sometime will build pressure on the gauge then drop to 0 and the check gauge light comes on. Shut the truck off and restart immediately and it builds pressure again. Normally 30-40 seconds after start up it does it but not every time. I put a mechanical gauge on it before it left and had good pressure but could not get it to do it with the mechanical​gauge on it. Anyone had this issue?
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Old 02-19-2018, 04:21 PM   #2
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Try another used, or a new sending unit?

Mark.
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Old 02-19-2018, 04:44 PM   #3
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No that's what I'm going to do tomorrow when he brings it back along with a mechanical gauge for a bit. I think it's either the sending unit or the Dash.
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Old 02-19-2018, 05:18 PM   #4
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I’ve seen quite a few sending units fail and some clusters
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Old 02-19-2018, 05:36 PM   #5
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Quote:
Originally Posted by pushlar84 View Post
I’ve seen quite a few sending units fail and some clusters
Do they act like what i described? Where they will go to zero then about 30 second late jump.back up or if you shut it off and immediately refire it jumps back up.
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Old 02-19-2018, 08:21 PM   #6
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Yes it would come and go
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Old 02-19-2018, 08:22 PM   #7
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Put my test gauge on it and never fluctuated at all
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Old 02-20-2018, 02:20 PM   #8
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agree. Ive had one do it. would be fine for a bit then zero out.. new sending unit..
 
Old 02-24-2018, 06:09 PM   #9
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So just to follow up so everyone can put this in their box of stuff to look for. I swapped the oil pressure sensor with no change. Left the truck over night and put a mechanical gauge on it after sitting all night and the truck wouldn't build pressure at the filter for a good 30-40 seconds and then would jump pressure up to normal. During the 30-40 second the gauge on the dash showed pressure. So after some head scratching and i found the bypass in the filter base was weak. Swapped out for another I had here and it builds pressure immediately at start up on the mechanical gauge.
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Old 02-24-2018, 09:21 PM   #10
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What brand was the culprit filter?
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Old 02-24-2018, 09:28 PM   #11
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Quote:
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What brand was the culprit filter?
Filter wasn't the cause. The actual filter base on the engine that the filter screws on to was bad.
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Old 02-24-2018, 09:48 PM   #12
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Seems that I recall the relief valve plunger assembly gets scored up on those.

Mark.
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Anarchy: The state of existence where there are no masters & no slaves. Therefore, Anarchy means the ABSENCE OF SLAVERY, or, in other words, FREEDOM.
 
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