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Thread: oil gauge shows no pressure , but there is pressure

  1. #1
    herb fraser's Avatar
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    oil gauge shows no pressure , but there is pressure

    So not sure what to look for , my Autometer oil pressure gauge shows no pressure , but I know there is pressure I one a port and loads of oil squirted out

    there is power at the gauge , on power ate the sending unit that I can see any thought would be very helpful
    Thanks in advance , Herb

  2. #2

    Steve >> aka: GoDadGo
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    Herb,

    Did you use Thread Sealer or Teflon Tape when you installed the sending unit?
    If you used Teflon Tape the sender may not be grounding.
    Hope this helps and sorry if it doesn't.

    Steve

  3. #3
    PLATNUM Supporting Member
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    Herb check all the wiring to and from the gauge as well as the grounds. You should be able to short out the wires to the sender and make the gauge go full pressure. Do it momentary with someone watching the gauge. If the gauge moves the sender is bad.

  4. #4

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    A common misconception. The instructions specifically tell you to use a thread sealant.
    .boB "Iron Man"
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  5. #5
    Senior Member ILPBFoot's Avatar
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    Could be a bad sender unit. Mine out of the box was bad. got a replacement and all is now good.
    Mk4 Roadster #9319, complete kit Received 4-10-18. Moser 8.8. 3 Link. Wilwood brakes. Blue Print 427, w Holley 850 Double Pumper, manual Choke, 501 hp with 498 lb-ft torque. TKO 600 0.64 OD

  6. #6
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    Resistance check it with a multimeter. Depending on the unit you either go pin to pin or pin to the body of the sending unit. If itís the issue you will know right away as the resistance will be quite a ways out. For the resistance value refer to an engraving on the sending unit or the gauge instructions for the gauge. If the sender tests ok then resistance check the signal lines/s. If they are good verify power and ground. If thatís good then itís the gauge. Odds are itís a broken wire or sensor.
    Mk4, Moser M88 rear end, Eaton truetrak, Craft Racing 461 Windsor, MMR pro trans, Glennís 1,000 hp cobra fuel system and lots of other parts.

  7. #7
    herb fraser's Avatar
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    Problem solved ! I replaced the wire form the gauge to the sending unit and all is well, must be a brake in the old line somewhere , its a Ron Francis fuse box and wiring harness .

  8. #8
    Senior Member phileas_fogg's Avatar
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    Mine did the same at first - wouldn't register pressure. Friend CraigS laid a wrench across the two terminals of the sending unit (Speedhut), and we saw the gauge sweep as expected. Started the car, pulled a valve cover, and confirmed oil was circulating. By the time we replaced the valve cover, the sending unit had "healed" itself and it's been working properly since.

    I called Speedhut and described what had happened, and they sent me a spare sending unit in case the original went bad. Very nice customer service.


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