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Conversation Between Peter and wetbirks
Showing Visitor Messages 1 to 6 of 6
  1. Peter
    07-22-2021 02:54 PM
    the OPSS installs in a port in the block near the back end of the engine on the manifold/carburetor side
  2. Peter
    07-22-2021 02:53 PM
    Fuel pressure gauge - this is an excellent diagnostic tool and you may want to install one before you replace the pump as at the moment you are guessing that you have too much fuel pressure. You want a metal gauge - not plastic - in case of a fire in the engine compartment. A plastic gauge would melt and then supply gas to the fire. Aircraft spruce seems to only have plastic ones.

    Hope that helps,

  3. Peter
    07-22-2021 02:52 PM

    The OPSS is an oil pressure safety switch. The electrical supply to the fuel pump goes through the switch. If you lose oil pressure the fuel pump shuts off and the engine then runs out of fuel and also stops. This switch is required by US Coast Guard - not too sure for Canada. Regardless, it is a sensible thing to have as it protects your engine in the case of oil pressure loss.

    you need to check which terminals are open with no pressure and close when there is pressure. Put the switch in-between the +ve terminal on the coil and the fuel pump.

    Polishing filter - they are very cheap and easy to install so yes.
  4. wetbirks
    07-22-2021 01:59 PM
    Can you tell me what OPSS is? Perhaps it's the gauge.
  5. wetbirks
    07-22-2021 01:57 PM
    Thank you Peter, I was struggling to find a Canadian supplier!

    Can you assist me with selecting a fuel pressure gauge from the same supplier? I am not sure what I am looking for when I see the options.

    Do you agree with the suggestion to include a polishing filter?

    Many thanks,

  6. Peter
    07-22-2021 08:54 AM
    For a fellow Canadian - Facet fuel pumps can be found at -

    Part number 05-10835

    OPSS - quite a few on Amazon


    PS - they also carry the facet “cube” pumps that are less expensive. These pumps were discussed here

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