tpapilot Posted August 29, 2015 Report Share Posted August 29, 2015 Travers day in Saratoga, so me and my wife decided to go to Marthas Vinyard for the day, After an uneventful run-up we lined up and took off, on climb out the fuel pressure started to bounce between 5psi and 15psi (I think I said something like we got a problem,, not the most comforting thing I've said ) the engine wasn't bobbling or running rough and I turned back, we had the mechanic look at the plane and it was bouncing while running but steady when just the electric fuel pump running. Just had them change out the EGT and 2 week prior the oil pressure sending unit, those items worked fine, could this be a ground issue? She's on the ramp till they build some additional hangers so I hope not to chase gremlins till then... Quote Link to comment Share on other sites More sharing options...
mike_elliott Posted August 29, 2015 Report Share Posted August 29, 2015 A long time ago I replaced the mechanical pump in my F (same motor) for the same reason. Not saying this is your issue, but it was mine, and sounds like yours. Of course, chase the cheap stuff first, like the gauge accuracy. The fuel pump isn't that expensive, just a B$tch to change. Quote Link to comment Share on other sites More sharing options...
mooniac15u Posted August 29, 2015 Report Share Posted August 29, 2015 In the J the engine gauge cluster has a common power wire and each gauge grounds through its sensor. If only the engine gauges are fluctuating it could be an engine ground problem. Have you checked the engine ground strap? If the fuel gauges are also reading wrong then it could be a grounding problem back at the battery. Quote Link to comment Share on other sites More sharing options...
Yetti Posted August 30, 2015 Report Share Posted August 30, 2015 Since it worked fine with the electric pump, I vote something in the mechanical pump is gone south. Quote Link to comment Share on other sites More sharing options...
Guillaume Posted August 30, 2015 Report Share Posted August 30, 2015 A long time ago I replaced the mechanical pump in my F (same motor) for the same reason. Not saying this is your issue, but it was mine, and sounds like yours. Of course, chase the cheap stuff first, like the gauge accuracy. The fuel pump isn't that expensive, just a B$tch to change. I had the same issue. Replacing the mechanical fuel pump fixed it. Quote Link to comment Share on other sites More sharing options...
tpapilot Posted August 30, 2015 Author Report Share Posted August 30, 2015 I'll chase down the cheap stuff then do the mechanical fuel pump if necessary,, Is this the leak down test that was mentioned on another thread ? Quote Link to comment Share on other sites More sharing options...
tpapilot Posted September 1, 2015 Author Report Share Posted September 1, 2015 It was a cheap issue, bad eyelet on the sending unit,, Woo Hoo 2 Quote Link to comment Share on other sites More sharing options...
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