Fuel tank and supply.

[w2much]

If I can siphon fuel from my tank can I take that as proof of free flow and no fuel restrictions.

 

[GA_Boater]

Siphon how? Through the filler or using the fuel outlet?

Through the filler proves nothing and through the fuel outlet means the anti-siphon valve isn't working.

 

[w2much]

O. K. I see the error of my post. I should have included there is no anti siphon valve, I took it out. I meant through the fuel outlet at but not into the engine. Just siphon from there to a tank on the ground.

 

[Watermann]

Well if the fuel flows it flows, whether or not there are any restrictions that what would be impossible to tell.

 

[GA_Boater]

Guess the real question is are you having fuel issues or trying to prevent any?

 

[w2much]

I see the error in my thought process. I was not pleased with your replies until I realized what was being said. I realize that whether it siphons or not the real issue would be rate of flow. It will siphon I guess no matter whether there is restriction or not, just a matter of how much as long as it is not closed off completely. Then I guess gravity and physics come into play. I did think I had a fuel flow issue , now no certain. Is there a vacuum number to work with. Fuel delivery at motor. Thank you all.

 

[Watermann]

About the only things that can cause a restriction other than a bad fuel pick up line from the tank to the fuel pump are

Anti-siphon valve that's defective
Screened pick up that has collected debris.
Lack of proper venting

I think the only way to know if you're getting proper fuel flow to the carb(s) is a pressure gauge between the pump and carbs.

 

[GA_Boater]

Also air leaks in the connectors will cause less gas reaching the motor.

 

[w2much]

Is there place in particular to run both a pressure and vacuum test? . If so if you know the pressure and vacuum numbers. Thanks.

 

[Watermann]

Just a pressure test, if it's getting the fuel at the correct pressure then all should be fine. Fuel pressure depends on the motor, no idea what your running.