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New 912 Fuel Pump

in 912 / 914 Technical Questions 13 years ago

  • Re: New 912 Fuel Pump

    by » 13 years ago

    California Power Systems (a.k.a. CPS) just got a big shipment in. Have you called them in the last 2 days.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell

    Thank you said by: Jez O'Hare
      
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  • Re: New 912 Fuel Pump

    by » 13 years ago

    Having a recirculation line helps reduce a chance of vapor lock. If you need to isolate a fuel line for any thing just use a set of hose pinch pliers and clamp it off. I use these all the time to isolate fuel tanks to pull wings or remove certain parts where I need to shut off the fuel flow. The problem with too much vapor in a fuel line and depending on where that vapor is the fuel pump can't pump a vapor if it's at the pump(the mechanical pump). If the large vapor hits the carb you will get a slight disruption in flow and may have a little roughness for a minute or so. Not too terrible, but maybe an attention getter. If I had a completely exposed 912 to the open air I may not worry about it, but some of these newer planes with really tight cowls and poor air circulation engines can be a different story. I usually see a plane land and is down for 20-30 minutes and then go back up and the pilot freaks out with a fuel pressure of 1.2 psi, but the engine doesn't quit, But let me tell you they all seem to land quick. :) The fuel line lines just set and cook after landing under a tight cowled engine. 91 oct. will do this faster than 100LL. Recirculation lines are very easy to install.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell

    Thank you said by: Jez O'Hare
      
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  • Re: New 912 Fuel Pump

    by » 13 years ago

    Thanks Roger. I will call CPS again asap.

    Sorry I don't understand what are "recirculation lines"?

    I am planning to install a parallel system on my trike similar to this drawing. If you have any advice where these re-circulation lines go - many thanks again :-)


    NEW912FUELSYSTEM.jpg (You do not have access to download this file.)
      
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  • Re: New 912 Fuel Pump

    by » 13 years ago

    Hi Jez,

    That will work. Some recirculation lines go back in to the gascolator. Some gascolators have the fuel line in and the fuel line out, but have another fuel line going back into the top from up by the carbs as your picture shows. Your setup is just going back into the tank. Either way you keep cooler fuel moving so it doesn't get so hot it vaporises and if it starts to vaporise it is circulating more cooler fuel sooner to help rid of the start of the problem.


    p.s.
    I'm not positive CPS got pumps in with this last big order so that's why I recommended someone call. They got a lot of stuff for the 5 year rubber hose replacement parts. If you need any of the 5 year the rubber replacement items CPS is the go to people. I helped set up a kit and you can order it complete. I did set it for for a particular plane, but it should be very close to the same for many. You will need to measure your hose line lengths to double check. Ask for Jeremy.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell

    Thank you said by: Jez O'Hare
      
    Report

  • Re: New 912 Fuel Pump

    by » 13 years ago

    Thank you Roger, now I see, 'recirculation line' is the same as fuel return line. My ACS gascolator has the connection you mention on top but I shut it off as my trike originally had a fuel return hose into the tank.

    I'll call CPS again about the new pump arrival tonight when they open. What rubber hoses do you mean? Fuel or Oil hoses? I have to replace all my fuel hoses again, the AN-Flex fuel/oil hose I got here in Indonesia have started to crack on outside after 1.5 years, not using them again. Some of my other hoses (for oil/water) were Bridgestone and they are still in great shape after 3 years.
      
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