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Comanche Engines and Propellers
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Topic starter
27/04/2020 7:20 pm
Fuel primer
I have a problem with my fuel primer. When the outside air temp is cold say below 45 degrees it will not prime the engine. I can feel it suck the fuel in but then it seems to go around the orings instead of to the cylinders. I have had my mechanic look at it twice and he has replaced them. Still hard to get primed. Does any body know where I can get a new one.
Thanks,
Todd Skalsky
- Todd Skalsky
- Posts: 15
- Joined: Mon Dec 06, 2010 4:50 am
Re: Fuel primer
Check that the line to the engine/cylinders isn't plugged or crimped before you replace the pump. Also pull the plunger out of the pump and make sure the check valve in the bottom isn't corroded, blocked, or stuck. Ray B
- Ray B
- ICS member
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- Joined: Wed Dec 23, 2009 6:02 am
Re: Fuel primer
I would suggest the following before you get a new primer. Disconnect all the primer lines at the cylinder base. Have someone operate the pump. If you don't get a good flow of fuel out of all the lines, you either have plugged lines (unlikely) or a bad pump (also unlikely). Assuming you have good flow from all lines, remove the nozzle from each cylinder. They should be clear. If not clean and re-insert. If one or two lines are plugged, try running some safety wire down the line. That should dislodge any blockage. It's very unlikely that the pump itself is bad. They are really simple. I'm betting on plugged injector ports if you have good flow from the lines. Handle the primer lines carefully. There is a small compression gland that seals the line into the port. Lines often break at that point, which requires replacement of the gland. They are hard to find. Not your usual plumbing store stuff. Good luck.
Dave Gitelman
- DAVEG24
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