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Fuel tank setup

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Ian Bagshaw12/05/2018 19:20:19
39 forum posts

How do people set up their fuel tank and engine so you don't loose power in outside loops or whenever the plane is in a vertical dive?

Currently my OS55 has a standard fuel setup with pressure from the exhaust with a one way valve, but when I'm at the bottom of the loop the engine is searching for fuel.

Many thanks


Jon - Laser Engines12/05/2018 19:26:00
4505 forum posts
164 photos

one way valve? whats that doing in there?

Tom Sharp 212/05/2018 19:36:20
3324 forum posts
17 photos

The piping on the clunk is too stiff leaving the clunk in clear air while inverted, or clunk is catching on the end of the tank and failing to drop down in to the fuel at the bottom of the loop.

Denis Watkins12/05/2018 19:37:42
3555 forum posts
166 photos

Ian, a motor that is run in, with no extra valves, and good plumbing, decent glow plug, with normal clunk will bunt.

So one or more requirements are adrift

Ian Bagshaw12/05/2018 19:56:58
39 forum posts

Many thanks I will do some checking the valve is to keep the system pressurised and stop unspent fuel coming out of the exhaust, works a treat.

stu knowles12/05/2018 21:46:46
535 forum posts
44 photos

The one way valve is the only thing that you don't need.

Better with a clip to apply after the flight to stop fuel running back into the exhaust during transport.(IMHO)

ASH.12/05/2018 21:51:21
262 forum posts


Ian, the way to prevent any fuel running back out through the pressure line is to loop the tubing up over the engine mount first then down to the exhaust. I always loop all three lines, it also prevents siphoning to an inverted mount. You will have to take the tank out and put in longer tubing, whilst there check free movement of the clunks and fit metal fuel clips at the outlets. No risk of slippage then.

As said above.. no extra valves!

ps it's good practise to drain tank of all fuel after flying session and burn off any left in carb line.

Edited By ASH. on 12/05/2018 21:57:07

Ian Bagshaw12/05/2018 22:38:12
39 forum posts

Thanks for all the advice I was just wondering if anybody had a different clunk setup, the valve system is just a one way valve & I have been using them for 35 perfectly


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