Leaking Fuel Pump Diaphragm?

[BRL]

My fuel tank is still located in the cab behind the seat and I know that if I disconnect the inlet line from the mechanical block mounted fuel pump the fuel will drain the tank dry without hesitation.
My question is that if the mechanical fuel pump diaphragm were to rupture or crack sometime due to age or something would it be possible for raw fuel to find its way into the crankcase?

[Steeveedee]

Yup. Fuel can flow until the level in the engine is the same as the level in the tank.

[BRL]

Originally Posted by Steeveedee

Yup...

That is scary!

I might drive my truck every few days now that I'm retired and it's embarrassing to have to crank the engine over for 20-30 seconds every time before it finally starts using today's fuel.

So I've decided to eliminate that problem by deleting the mechanical pump and replacing it with an electric.
Yea this pump is probably overkill but those selinoid pumps sound like a friggin' jackhammer.

Thank you for the reply and Happy New Year!

[Steeveedee]

You're welcome! I have an electric fuel pump that my FiL put on. He did it because he would run a saddle tank dry and the switch tanks. The electric pump got fuel to the engine sooner. It is a solenoid type, and yes, it's a real clacker. I do use it if the truck hasn't been started for a few days.

[72c20customcamper]

Going to electric I would put an oil sender safety cutout on it or an inertia switch .

[BRL]

I totally agree with you on that suggestion (thank you )although an oil pressure switch would probably put me back in the same hard start boat I'm already in.

If I get hit hard enough to rupture a fuel line or even the in-cab tank itself, the fuel isn't going to need any help spilling everywhere.

There's something to say about peace of mind though.

Standard Motor Products FV-7 Fuel Pump Cut-Off Switch Assorted, One Size https://a.co/d/7eUrqhi