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fuel shut off
Posted: Sat Dec 07, 2013 8:09 pm
by macibell111
did all m37s come with a fuel shut off just before the fuel pump?mine has one and I have seen others ,is it needed?
Re: fuel shut off
Posted: Sat Dec 07, 2013 11:07 pm
by w30bob
Macibell,
I believe all M37's did come with the fuel shut-off valve. As to it's purpose......without thinking too hard I'd say it prevents the fuel tank from gravity draining all over the floor when you disconnect the fuel line at the pump inlet. I could be wrong, but I believe the fuel level in a full fuel tank is higher than the inlet to the pump. Correct me if I'm wrong guys.
regards,
bob
Re: fuel shut off
Posted: Sun Dec 08, 2013 5:26 am
by Tom P
You are Correct about all had them. Your reason would be my guess also. I know it is handy if it's not stuck open.
It is all brass and gives very little trouble.
Makes for easier/safer service.
TGP
Re: fuel shut off
Posted: Sun Dec 08, 2013 6:05 am
by Carter
It is also used to stop the fuel flow if the carb. is flooded, shut the valve then crank the engine 'til it fires/runs then open the valve to allow the normal operation. Works great when a hot engine is flooded due to fuel boiling in the system.
Re: fuel shut off
Posted: Sun Dec 08, 2013 8:32 am
by ZGjethro
Can anyone think of a reason for a fuel disconnect if you have an electric pump? Is it possible for fuel to flow through an electric pump in the off position? I am thinking about safety if working on the engine/carb. I disconnected the old engine bay lines and ran new ones when I went to the new pump.
Re: fuel shut off
Posted: Sun Dec 08, 2013 3:46 pm
by w30bob
Hi ZG,
I would assume having a shut-off upstream of any pump, regardless of type, would be beneficial.....otherwise how do you replace the pump when the time comes without draining the fuel tank (assuming your pump is below the level of the tank). If the pump is higher than the tank level then there's probably no reason. I don't know....what does the rest of the crew have to say on this one??
regards,
bob
Re: fuel shut off
Posted: Sun Dec 08, 2013 4:37 pm
by macibell111
that answered my question and then some ...that all makes perfect sense.thanks for the great info,that is what I needed to know.
Re: fuel shut off
Posted: Mon Dec 09, 2013 4:55 pm
by pwrwagonfire
w30bob wrote:Macibell,
I believe all M37's did come with the fuel shut-off valve. As to it's purpose......without thinking too hard I'd say it prevents the fuel tank from gravity draining all over the floor when you disconnect the fuel line at the pump inlet. I could be wrong, but I believe the fuel level in a full fuel tank is higher than the inlet to the pump. Correct me if I'm wrong guys.
regards,
bob
Bingo. Mine is stuck open, preventing it's usefulness when I blew a fuel hose in November...
