Fuel pump over flow hose
 

Whats the best, and easiest way to attach this hose? I jave a quick fuel marine 850 carb. Only ports i see are vacuum (2) on the front (1) on the back ,which is larger pcv? Those 3 are capped. Also one on the primary metering block uncapped.

Nothing else i can see and nothin on the flame arrestor. I have a polished flame aresstor so want what ever i do to look nice. And i lose sleep thinking about something backing off a fitting and getting injested into my motor with 1 hour of run time.

What would you peeps do? Not wanting to switch to and electrical pump at this time

Thanks.

Im convinced i was running around last summer with it going to no where. Old holley carb also has mo provisions for it and from the pictures i have last year i can see the hose running along the fuel line but it doesnt look like it went anywhere and it just laid on the intake (dart high rise)

Dont connect to vacuum ,in some cases it creates suction on fuel pump diaphragm which alters (lowers) pump output. Just find a clean way to secure it. Good Luck!!!

Unless your willing to drill a hole thru the flame arrestor, you could run the overflow tube back to your fill hose, but that defeats the purpose. Don't see any fitting which will work otherwise.

It is supposed to be where the intake air stream will inhale it to keep it out of the bilge. I think drilling a fitting up into the base of flame arrestor would be acceptable and the least aesthetically disruptive.

It is amazing how well the hose works since it keeps gas from diluting the oil in the raw water pump to such a high extent.

And how much vacume do you think will be pulled routing it through the flame arrestor like that?

I do this and screw a barb fitting in the hole. Pretty easy. Make the hole just a hair smaller than the threaded part of barb fitting and then screw in the barb fitting.Obviously do this on the base of the flame arrestor and in a spot the fuel will flow back down into the carb.

I have seen this on several boats that I was diagnosing for running issues. Go figure - lol.
Yes, applying vacuum to the fuel pump vapor fitting on the pump will decrease fuel pressure as it's on the side the psi spring is on.

Thanks. I guess ill have to bite the bullet and drill a hole. 😬

The purpose of that hose is to keep fuel from spilling into the bilge should the diaphragm rupture. After a few mods and fancy new air cleaner I've seen people just drop the hose in the bilge for years with no problems, but I'd certainly sleep a little better with it routed into a dump tank of sorts, aka the engine. I wonder if a charcoal canister of some sort would be a viable option?