K-Plane Reservoir Leakage
 

I have an old Formula 311 that has developed a leaky- or seeping -K-Plane reservoir. The fluid is seeping from the union between the pump and the plastic bottle (which is pretty loose- the bolt that holds it to the bottom of the pump is tight). Any thoughts (of the constructive repair variety) would be appreciated.

Re: K-Plane Reservoir Leakage
 

Take it appart and see if you have a bad O-ring between the pump and housing......that may be causeing the leak. If thats not the problem and maybe the plastic has warped i would probably try putting a few washers between the bolt and the housing to take the slack up.....or just buy a new housing :)

Re: K-Plane Reservoir Leakage
 

If your pumps are bolted to the transom like mine were that could be the problem. Most transoms are at a 11-13 degree angle. That is why my pumps were leaking. I tried replacing the O-ring and it did not work. I cut a 12 degree wedge out of wood and put it between the mount for the pump and the transom. No more leak.

Re: K-Plane Reservoir Leakage
 

The newer pumps and reservoirs are now attached with 4 screws from the top and shouldn't have a problem with the o-ring seal. They also come with a different cap to help stop leakage there. There is an in-between pump assembly that had the single bottom screw old reservoir, but the pump had the locations for the screws. If so, you can just get the newer reservoirs.

Re: K-Plane Reservoir Leakage
 

I will check out the new reservoir idea. The pumps are on the inside of the rear bulkhead / firewall. They are at a significant angle when the boat is in the water, so the fluid is always slopped up against the top of the reservoir.