Oil Pump
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New User
Joined: Aug 2007
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Oil Pump
I have a 95 150 5.0 farm truck. It leaked oil from the oil pan very bad. I pulled the engine and replaced the oil pump ( just because the engine was out) and replaced the oil pan gasket. After putting the engine back in the it has no oil pressure. When replacing the oil pump I only removed the bolts and gaskets and put the new one in. Should have I primed the pump in some way? Is there any way to prime the pump without pulling the engine again? Is there some other reason I am not getting any oil pressue. The engine is chattering very bad. I only ran it for about 30-45 seconds. Do I need to let it run longer for the pump to operate? any replies is great. Thanks in advance!!!
Senior User
Joined: Nov 2007
Posts: 474
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From: The blues
DO NOT restart it and let it run long if you have no oil pressure, or you will no longer have an engine.
When you replaced the oil pump did you make sure the drive shaft went into the bottom of the distributor. A way to check if it's in the right place or the prime it with out starting the engine is to take out the dizzy. the oil pump drive shaft should be in the circle at the bottom of the dizzy hole. To prime it you'll need the right size socket for the oil pump driveshaft, a drill, and extensions.
When you replaced the oil pump did you make sure the drive shaft went into the bottom of the distributor. A way to check if it's in the right place or the prime it with out starting the engine is to take out the dizzy. the oil pump drive shaft should be in the circle at the bottom of the dizzy hole. To prime it you'll need the right size socket for the oil pump driveshaft, a drill, and extensions.
Elder User
Joined: Feb 2008
Posts: 797
Likes: 1
From: ohio
pull the distributer (sp) and make up a tool to prime the pump using a drill. Always fill the new pump with oil and turn it by hand to suck oil up. One time i did not do that on a chevy and i put 2 xtra qts of oil and the pump primed. Not the way to do it but if u do not feel like pullin dist u could give it a try. just drain off xtr oil after u get pressure
Elder User
Joined: Aug 2006
Posts: 813
Likes: 1
From: foristell, missouri
check your sensor real quick, theres no reason to fret over something until youve checked the simple things first.
learned awhile ago to check the simple inexpensive things first before you get mad and break things causing great expeditures
learned awhile ago to check the simple inexpensive things first before you get mad and break things causing great expeditures
Post Fiend
Joined: May 2004
Posts: 11,289
Likes: 6
From: Lakewood, Ohio
I have a 95 150 5.0 farm truck. It leaked oil from the oil pan very bad. I pulled the engine and replaced the oil pump ( just because the engine was out) and replaced the oil pan gasket. After putting the engine back in the it has no oil pressure. When replacing the oil pump I only removed the bolts and gaskets and put the new one in. Should have I primed the pump in some way? Is there any way to prime the pump without pulling the engine again? Is there some other reason I am not getting any oil pressue. The engine is chattering very bad. I only ran it for about 30-45 seconds. Do I need to let it run longer for the pump to operate? any replies is great. Thanks in advance!!!
did you put oil back in?
did you replace the oil pickup screen?
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Post Fiend
Joined: Mar 2002
Posts: 19,402
Likes: 38
From: Bonita Springs FL
What the gauge says doesn't matter. If it's chattering "very bad" then it's pretty obvious it's not getting any oil. Like others have said, you have to prime a new oil pump with a drill. It's not hard to do, but it is a necessary step.
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