Let's talk pulse pumps

[Bansil]

So was going to order a fuel pump.

I was going to get the walbro one on bmi site, but noticed aluminum mukuni 1 also and then some cheaper pumps.....what to get? I will still be gravity fed also.

Walbro is my choice now.

Any pro/cons on pumps?

 

[madprofessor]

Only thing I know is that I did not know about pulse pumps when I got a plastic Walbro. Didn't know if it would take multiple recoil starter pulls to get fuel to the carb if fuel lines drained back to tank.
To be sure the lines would never empty out, I mounted the fuel tank above the pump, and the pump is on a master top plate kit above the carb.
I can say that with that setup, and the pulse to the pump tapped from the correct side of the hemi valve cover reed valve, the pump has never once caused me to take an extra pull on the recoil starter.
Note: I have 2 transparent fuel filters, and they're inline between tank and pump, and between pump and carb. Don't need double-filtering, they're to see where I've got fuel reaching to if motor won't crank up someday.

 

[karl]

I have used/ use the sealed plastic mikuni pumps , aluminum rebuildable mikuni pumps, china knockoffs,
and walbro pumps. All do the job just fine, especially for a 212cc. You won't notice much difference between any of them.

I collected a lifetime supply of the sealed mikuni type pumps used on honda 5hp gc160's to Kawasaki 27hp V-twins,
from warranty motors and such, so that's mainly what I run nowadays. My 674cc kart runs a twin pump setup with y-fittings
for extra flow, as it starved @5k.

Just pick what makes you happy.

Didn't know if it would take multiple recoil starter pulls to get fuel to the carb if fuel lines drained back to tank.

Yep, that's typical with these small engine pulse pumps. When running the factory 212 carb at 6k+ rpm with gravity feed,
the bowl will run dry. So even with gravity feed, a pump is still needed to avoid this.

If using a big block carb or slide valve with much larger bowl, gravity feed alone is not an issue.
Both my monster moto's run gravity feed only and can be held wide open for miles and not starve.
Big block honda carb, and vm22.

Id rather have more filtering than not enough.