Fuel pump - 10hp 1961

[taki]

While I’m waiting on the carb kit - is my fuel pump original (=not serviceable)? Is there a screen under there I can clean at least?
Also, is there a way to check if the diaphragm is intact without taking the thing apart?

Pic attached.

Thanks

 

[boobie]

Before taking it apart check and see if you can get parts for it. Best thing to do is see if it works and leave it alone.

 

[F_R]

Do not take it apart. You certainly will tear the gaskets if nothing else. Parts for it have not been made for 50 years. Replace the whole pump if necessary. There is a screen by removing the larger hose nipple.

If you think the diaphragm is leaking, unbolt the whole pump from the motor and give teh primer bulb squeeze to see if gas squirts out the hole in backside of the pump (should not). Morel likely is diaphragm has turned rock hard. If that happens,it just won't pump well.

 

[taki]

Whew, dodged this one. Thanks. I guess if I take it off I need to make sure the gasket is available at least (looks like it - 0303615).

F_R, Is that right to assume the pump is designed to work in excess and the carb restricts the fuel supply? So even with partial pump output should still be ok? Maybe I can see the bowl is emptying during high load that would indicate insufficient fuel delivery before the engine will start losing power.

 

[oldboat1]

In your earlier post, you said the motor was overheating even after a new impeller. Also asked about the fuel pump. As indicated there:

Pull out the thermostat and run the motor without it. If you can keep it running (and it's cooling properly -- at least not overheating), take off the fuel line at the carb and see if fuel is being pumped. Assuming it's running cool and pumping water and fuel, replace the thermostat and gasket. But consider getting a replacement pump for future use, as diaphragms are hard to find for the original '61 version (replacement pump is the small square one).

 

[F_R]

Whew, dodged this one. Thanks. I guess if I take it off I need to make sure the gasket is available at least (looks like it - 0303615).

F_R, Is that right to assume the pump is designed to work in excess and the carb restricts the fuel supply? So even with partial pump output should still be ok? Maybe I can see the bowl is emptying during high load that would indicate insufficient fuel delivery before the engine will start losing power.

Well yes, that pump was used on as big as 35hp motors. Don't fall into that trap of "no fuel in the glass bowl" thing. They normally run with little or no gas in the bowl. Don't strain your brain trying to figure that one out. Capillary action or something. Saving my brain.

 

[Joe Reeves]

(Fuel Pump Diaphragm Test)
(Two Hose Type Only)
(J. Reeves)

Note: This pertains only to the regular Two Hose type fuel pumps.

Leave the hoses attached to the fuel pump. Remove only the two screws that attach the fuel pump to the powerhead. Re-insert those two screws and install a nut to each of them so that the fuel pump is securely clamped together. With the fuel line attached to the engine, pump the primer bulb while observing the pressure/vacuum operating hole on the back side of the fuel pump. Should any fuel leak out that hole, the diaphragm is faulty.

If the diaphragm is faulty, the fuel pump will require rebuilding or replacing. Note that repair kits are not available for all fuel pumps, in which case replacing the pump would be necessary.

 

[taki]

oldboat1 - will do as soon as my carb kit is here and implemented. In the meanwhile pulled the thermostat- a piece or rust. Getting a new one.

Joe - thanks. I’ll be touching this one last after the carb is in order.

F_R - thanks. I’m still looking for parts for my brain - no new old stock available, and I don’t like the aftermarket ones...

in the meanwhile - fine metal powder in oil - tested the lower apart - the forward bracket pin might have been damaged in the past. It’s still sticking out , but just a little bump. Not sure what the pin height should be - looking into a new one if available.

Conclusion - no fishing so far, but enjoying the work almost as much...

 

[taki]

Update - pulled out a nice "vintage" thermostat manufactured by Dole Valve Co., in Morton Grove IL, stuck open! Their plant in Morton Grove was shut down in 1968 btw...

 

[racerone]

They commonly fail -----STUCK OPEN----See it all the time.