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  • Gas in Oil

    Recently I found the oil pan full of gasoline. I attributed this to a leaky fuel pump, sticking carburetor float valve and/or hydro-static pressure from a full tank of gas. I drained the gas/oil mixture and changed the oil filter. I've added new oil and ran the engine to operating temperature. Excellent oil pressure. I plan on replacing the oil and filter again. Are there any other items which might require attention in addition to the oil and filter? Thank you in advance for any suggestions!
    JHowe

  • #2
    Which was it that caused the problem, Jim ?
    Driving a 1973 TR6
    Doing ZS carb repairs
    email kencorsaw"at"aol.com

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    • #3
      I am not certain which issue specifically caused the problem. I have read your comments on this site as well as another regarding this issue. I have followed your advice and purchased 2 pinch shut off valve's and installed one upstream of the fuel pump and one upstream of the carburetors. By process of elimination I believe the fuel pump is the culprit in combination with the hydrostatic pressure from the fuel tank. This problem only surfaced after I filled the tank for the first time after taking delivery of the vehicle. BTW, thank you for your Helpful comments here as well as on another site. Your insight is invaluable.
      JHowe

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      • #4
        Thanks, Jim...I think you'd have to have a hole or tear in the fuel pump diaphragm for gas to enter the sump from the fuel pump; so if you think that's the culprit, you better make sure or it'll happen again when the engine is running, full gas tank or not.....but to answer your question, following the 2 or 3 times I had that happen to me, I just drained the oil and changed the filters.
        One time there was so much gas in the oil, it nearly overfilled the oil drain pan..
        I had to be very careful not to spill it as I was sliding it out from under the car.
        Having said that, I had already developed the habit of checking the oil before starting the engine the first time that day so I discovered the situation before start up....no harm done by the dilution, just a premature waste of oil and a filters.
        Last edited by poolboy; 01-09-2019, 12:11 AM.
        Driving a 1973 TR6
        Doing ZS carb repairs
        email kencorsaw"at"aol.com

        Comment


        • #5
          Thank you Poolboy. I will be double checking. So much gas leaked into the sump a mixture of oil/gas was leaking out somewhere near the rear of the engine! I don't know how that could happen. What ever the issue is, I plan on rebuilding the fuel pump. Thanks again!
          JHowe

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          • #6
            Sounds like it filled up so much that it leaked out around the rear crankshaft seal.
            The fuel pump diaphragm, be it 'red' or 'black' is pretty robust and thick, plus it's usually multi-ply in construction.
            If there's a defect, you should be able to spot it.
            Driving a 1973 TR6
            Doing ZS carb repairs
            email kencorsaw"at"aol.com

            Comment


            • #7
              UPDATE: Twice the engine was started with the car static and ran up to operating temperature. Neither before or after each run-up was any fuel detected in the sump. After each run-up the fuel lines were clamped off via a pinch type valve upstream of the fuel pump and carburetors. After the second run-up, which lasted for 10-15 minutes, fuel was detected leaking moderately from the aft area of the underside of the air filter housing. After removal of the air filter housing, fuel leaking from the air intake of the fore carburetor was noted. In the air intake of the aft carburetor a tan/cream color residue was noted at the base of the plunger. At the time of purchase, September, 2018, the PO indicated the carburetors had been rebuilt. From the exterior appearance of the carburetors, it does not appear they have been disassembled. Thank you in advance for any thoughts on the topic.

              JHowe

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              • #8
                Sounds like you have at least one leaking jet. Would probably be a good idea to get them rebuilt. Poolboy (Ken) does a great job with that at a very reasonable price.
                I72 Pimento w/overdrive

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                • #9
                  I 2nd that.
                  Sounds like you are a little perplexed with the carb possibilities. Poolboy knows what to do to fix the leak, he does a fantastic job for low cost.
                  Your carb troubles will be over, after he touches them.
                  Walt
                  CC80954U '72 TR6 original condition/sold 16.500.
                  poolboy rebuilt the Z-S Carbs. Philstr6 rebuilt both rear hubs.

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                  • #10
                    Thanks for the endorsements, Lou and Walt.
                    I didn't think it was the fuel pump, but since Jim was considering rebuilding his fuel pump, I thought it best to illustrate what to look for.
                    Driving a 1973 TR6
                    Doing ZS carb repairs
                    email kencorsaw"at"aol.com

                    Comment

                    Gas in Oil

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