Fuel pump

[markseven 84]

Mine fuel  pump is  leaking around the gasket  it original .

Tried tighten the screws still leaks .

Do not want to buy an aftermarket one.

Are they rebuildable and where to get the parts?

[ri702bill 10,951]

What engine exactly?? Different engines, different options.

[Achto 30,435]

https://www.amazon.com/Ciuouient-230675-Diaphragm-Rebuild-Compatible/dp/B0F1XYDS4B/ref=sr_1_4

[markseven 84]

Its a kohler k301 12 hp

It always starts and runs good 

But it always takes some time cranking it over before it fires.

I ordered the kit hoping it helps. 

Thank you. 

[Achto 30,435]

8 hours ago, markseven said:

I ordered the kit hoping it helps. 

 

If this does not fix your issue, then you might consider switching to an electric pump. They usually render faster cold starts.

 

https://www.amazon.com/Electric-Universal-Pressure-Transfer-Carburetor/dp/B08PY7V2MM/ref=sr_1_4_pp

[WHX?? 53,703]

12 hours ago, markseven said:

ordered the kit

For the short money they are I keep one on the shelf. If the pump isn't too gunked up and check valves are good no need to buy a pricier then & now kit. 

 

I like to glass the pump halves as they can warp from over tightening. That said don't over tighten on a rebuild.   

[kpinnc 16,507]

23 hours ago, WHX?? said:

like to glass the pump halves as they can warp from over tightening. That said don't over tighten on a rebuild.   

 

Just did the same on mine. Prolly gonna be next week before I order a kit. Complicated for what they are...

 

 

[markseven 84]

It starts insanity now with the new 

Diaphragm. 

Only problem is it still leaks .

 

 

 

[markseven 84]

On 1/4/2026 at 9:44 PM, WHX?? said:

For the short money they are I keep one on the shelf. If the pump isn't too gunked up and check valves are good no need to buy a pricier then & now kit. 

 

I like to glass the pump halves as they can warp from over tightening. That said don't over tighten on a rebuild.   

Still leaks the diaphragm i ordered

Wasn't exactly the right one.

I had to slightly oblong the holes in 

The gasket in order for the four 

Bolts to go thru.

Maybe this is causing the leak.

What to you mean by glassing the two

Halves?.

[pfrederi 19,450]

Fine emery cloth  or wet dry sandpaper on a sheet of glass.  Rub the pump mating surface on it

[sqrlgtr 1,770]

Just according to where you get the diaphragm from, some are pretty thin. The last one I done leaked so I made a gasket that goes between diaphragm and pump body, took care of leak so far. Used the rubberized gasket making material. The diaphragms isavetrctors used to sell were superior to others I've had and did not require a second gasket. I wish I knew where he sourced them from.

[Handy Don 15,594]

57 minutes ago, markseven said:

I had to slightly oblong the holes in 

The gasket in order for the four 

Bolts to go thru.

The holes were correct originally. The correct install “scrunches” the diaphragm to provide slack for the pumping action. This is done by manually holding the pump actuator lever so that it is pulling the diaphragm. While holding, successively adding tightness (i.e. not all at once on each screw) squeezes the seemingly excess material evenly.

A taut diaphragm install causes poor pumping and early diaphragm failure. 

 

Glassing as noted above. 

Edited 19 hours ago by Handy Don

[sqrlgtr 1,770]

9 minutes ago, Handy Don said:

This is done by manually holding the pump actuator lever so that it is pulling the diaphragm.

Glad you mentioned that. I really dont see how one would get pump back together without doing that way .