STILL no oil pressure!!! please help me out!

[fox racer]

Ok, well i just swapped out my stock pump for a melling hi volume pump. and my auto meter gauge still reads ZERO! im 90% sure the pickup is fine and not clogged, so what else can cause me zero oil pressure?? when i kill the motor the needle drops to the bottom of its sweep, when the car is running it reads 0, so i guess its getting a reading.


please help me out with ideas!

 

[Bladez5_0]

The sensing line may be clogged or your gauge may be toast. Do you have a friend with the same type of gauge? Maybe try a swap. Not sure if air in the line might cause something like that or not.

 

[TheUser]

you did put oil in right?

perhaps you could attach the stock wire to see what the stock gauge says.

 

[5.0Droptop]

If when you start it do you hear lifter noise? take the gauge off and put the line in a deep cup with a lid and use a pump priming tool and see if shoots out.

 

[fox racer]

yea new oil and new filter too. it made no noise before i swapped the oil pump, just the rockers were slighty noisy (cobra rockers). i couldnt really tell if they were makin noise again as it only ran for a few seconds (6-630 PM open long tubes...).

 

[fox racer]

my stock gauge read 0, so i put in an auto meter, that read zero... (electric) so i decided to swap pumps. never drove the car since the suto meter reads 0.

 

[5.0Droptop]

The gauge is prolly bad or the sending unit. or crimped line.

 

[HISSIN50]

Or pull a VC and prime it and look for oil at the top end. Do the same with it idling if you have pressure.

First (Like I think i suggested before), as others said, use a real gauge.

The gauge's movement might not be pressure but the simple application of the gauge energizing with 12 volts.

 

[5.0Droptop]

I like Mechanical oil press gauges. I dont have stock gauges in my 91gt but even if I did I would run a mechanical oil press gauge.

 

[fox racer]

so i should get a mechanical gauge? how about if i rigged up a small line to there the sending uni is and see if oil comes out?

 

[5.0Droptop]

so i should get a mechanical gauge? how about if i rigged up a small line to there the sending uni is and see if oil comes out?

You can rig it up to test it. I would Definitly buy a mechanical guage even if its a sun pro from autozone. It would suck to find out you went thru all that trouble of changing pumps over a gauge failure.

 

[Juiced88Coupe]

Did u check clearance between the pickup and the bottom of the pan when you reinstalled the pump?

 

[88Stangboy]

i would use mechanical guages to, thats all i use. And i wouldn't have put a high volum pump in there anyways. A stock pump is good up to about 500-600hp. Should have gotten an ARP oil pump drive shaft and stock pump. Try a different sending unit, you may be 90% sure, but i would definatly try that before i tried replacing the pump.

 

[1SLO306]

pull the oil filter and see if its even pumping. pull the dizzyand see if the oil pump shaft is still in place.

 

[jrgixxer]

remove sending unit and attach mechanical gauge

 

[ExplodingGopher]

Not being a smart ass, but did you reinstall the oil pump shaft?

 

[1SLO306]

Not being a smart ass, but did you reinstall the oil pump shaft?

i was thinking that but didnt want to say it LOL

 

[69Rcode_Mach1]

Did you make sure to install it from underneath and not just drop it in from the top?

 

[ExplodingGopher]

Did you make sure to install it from underneath and not just drop it in from the top?

Doesn't matter, i forgot to put mine in form the bottom and just put it in through the top, its fine, just a PITA when you're putting it in and it slips and falls into the oil pan. That happened to me twice GD it.

 

[TheUser]

I thought my autometer electric gauge came w/ a new sending unit.

If you're running a new sending unit and new wiring to the autometer gauge - and it's wired properly - I really doubt it's a gauge issue. Mechanical is probably the most accurate, but my electrical is fine. I chose a mechanical water temp just so I could see the temp any time, but don't want to see the oil pressure when the car is off.

I would consider pulling a valve cover and seeing if there's oil on top; however, if you start the car w/ the valve cover off, you will have a mess if the pump is working - been there, done that.