Gas tank position - below motor??
Hello,
I'm really confused with this issue. I just built a small airboat with a OS MAX 25FP and I mounted the gas tank (6oz.) below the motor but I am having trouble with the fuel siphoning and having to constantly prime the fuel line. Do people use something like a one-way valve in the fuel line? How do you guys do this? I'm baffled. Thanks |
Originally Posted by MarkPrima
(Post 12312973)
Hello,
I'm really confused with this issue. I just built a small airboat with a OS MAX 25FP and I mounted the gas tank (6oz.) below the motor but I am having trouble with the fuel siphoning and having to constantly prime the fuel line. Do people use something like a one-way valve in the fuel line? How do you guys do this? I'm baffled. Thanks When the engine is running, the fuel should not siphon back due to the fuel draw of the engine. The only way to combat the fuel siphoning is to mount the fuel tank behind the engine ensuring the center of the tank doesn't sit above the center of the carburetor (spraybar). Do not use a check valve in the feed line - you will have carburetion problems. |
Thanks, I may redesign my next air boat and have the fuel tank behind the motor as you mentioned. But I do like the looks of having the fuel tank below.
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Originally Posted by MarkPrima
(Post 12313163)
Thanks, I may redesign my next air boat and have the fuel tank behind the motor as you mentioned. But I do like the looks of having the fuel tank below.
Most engines will draw fuel fine when the tank is right under the engine - any more than that and the engine may have issues. |
Originally Posted by MarkPrima
(Post 12313163)
Thanks, I may redesign my next air boat and have the fuel tank behind the motor as you mentioned. But I do like the looks of having the fuel tank below.
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That looks very nice. Congrats on the build, and thanks for sharing.
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you still have enough space to put the fuel tank behind the engine. having the tank down low will not only effect starting and running issues but also you will get lean runs which is no good for the engine.
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Originally Posted by crapshooter
(Post 12314316)
you still have enough space to put the fuel tank behind the engine. having the tank down low will not only effect starting and running issues but also you will get lean runs which is no good for the engine.
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