Evinrude 1969 9.5hp fuel pump spring

[cropduster21]

I just bought this little motor yesterday. Estate sale. The man selling said it was his fathers and it would probably need to have the carb cleaned and a new impeller. I'm pretty handy with motors so I bought it. I need an aux motor for my center console boat.

I'm working on it today. The motor fires when gas is injected into spark plug holes. I dont have a gas tank yet but I tore into the carb and squirted carb cleaner through the jets. They look clean. bowl was clean. cork float doesnt look to good. The bowl was so clean I guessed someone had it apart before me. I took the fuel pump off to see if the screens were clogged. Everything looked clean. NOW the problem. I think someone had been into the fuel pump before me. The diaphram looks like it has been repositioned someway. There was only one little coil spring under the diaphram, and there are 2 small stud to set the spring or springs onto.

My question is. Are there supposed to be 2 springs under the diaphram? one for each of the 2 studs? if not which is the correct stud for placing the single spring. How much is a fuel pump kit and where can I find one. Also a new float.

Thanks for your help!

 

[tashasdaddy]

Re: Evinrude 1969 9.5hp fuel pump spring

look at parts diagrams, http://shop2.evinrude.com/ext/index.aspx?s1=bf6ad09c53cead335fcfd8a6471c0f7f

 

[ezeke]

Re: Evinrude 1969 9.5hp fuel pump spring

The position of the spring depends on the location of other parts. Here is the link to the story: http://www.sschapterpsa.com/ramblings/Rebuilding_fuelpump.htm

 

[cropduster21]

Re: Evinrude 1969 9.5hp fuel pump spring

FANTASTIC! Now with that information I hope I can get this puppy purring. I didnt know Napa would carry this kit. I will call first thing tomorrow.

I appreciate your help.! one more thing, Does Napa carry the Carb repair kit with a new float?

thanks, Jack

 

[ezeke]

Re: Evinrude 1969 9.5hp fuel pump spring

You need the OEM kit for the carburetor. The float is key to the rebuild because it is cork and only BRP still supplies them.

 

[cropduster21]

Re: Evinrude 1969 9.5hp fuel pump spring

Ok BRP I will look them up. But now I think I have a bigger problem. This thing is only showing 65 psi compression at wide open throttle and at start throttle. That seems about half to what I would call good.
What do you think?

 

[BigB9000]

Re: Evinrude 1969 9.5hp fuel pump spring

its a single cylinder?

Put it together and see what happens.

you already bought it, and a fuel pump is $15

 

[ezeke]

Re: Evinrude 1969 9.5hp fuel pump spring

That compression is all right for the 9.5. It is not the best but it will run. It does not matter whether the throttle is open or not on a two stroke, the compression will read the same with both spark plugs out. The compression will probably read higher once you run the motor a bit.

BRP is the successor to OMC for the ownership of Johnson/Evinrude after the bankruptcy. The carburetor kits for the 9.5 are available from any of their authorized dealers worldwide. http://dealerlocator.evinrude.com/EN/?Rnd=1172157085156

You can also buy from their on-line store: http://shop.evinrude.com/

Click the diagram in the upper right corner of their page and navigate to your motor.

 

[Woodstock60]

Re: Evinrude 1969 9.5hp fuel pump spring

I agree 65 psi on both cyl. is allright for the 9.5, I have had 3 of them that all run great and all three are @ 65 psi

 

[Rick.]

Re: Evinrude 1969 9.5hp fuel pump spring

Once you get her running nice you should do a Seafoam treatment. That could well improve your compression by cleaning out your cylinders carbon and unsticking the rings. I agree 65 isn't abnormal when it comes to the 9.5 engines.
Best of luck, Rick.

 

[cropduster21]

Re: Evinrude 1969 9.5hp fuel pump spring

Ok, I just installed the new fuel pump kit. However it did not come with one of the diaphrams (the diaphram where the smaller sping is under) so I had to use the old one. I went by the excellent directions that one of the crew guided me too. Motor still trys to run but only runs what gas I put down the carb throat.. I'm thinking carb kit next.

I tested the pump by being able to blow into the intake port and was not able to blow into the output port. So thats supposed to be good.

My question: How does this pump work? is it by vaccum? I'm I missing something mechanical with this motor.

What purpose is the large nickle size disc under the main diaphram? mine is tight in that pocket. Its egg shaped by about .010" and wont turn once placed in the pocket for it in the housing.

Thanks once again for your help. I'm gonna get this baby going or else!

 

[ezeke]

Re: Evinrude 1969 9.5hp fuel pump spring

The pump is driven by the vacuum/compression cycle of the piston. The center hole in the back of the pump provides the opening. As long as the gasket between the fuel pump and the engine is airtight and the membrane is good, the pump will function.

 

[cropduster21]

Re: Evinrude 1969 9.5hp fuel pump spring

Ok I have cofirmed the fuel pump is working. Squirts an 18 inch squirt while pulling start cord with fuel hose disconnected from carb. (thats from a 1ft standing hose connected to the fuel pump intake.) Havent bought a tank for this thing yet. I figure if it wont pull from this hose it sure wont pull from a tank sitting on the floor. (or am I wrong here?)

Motor still wont run any longer than the fuel I squirt down the carb throat. I have squirted carb cleaner through all the orfices I could find and they seem clear. The reeds are visable with carb top off and I can gently push on each of the 4 reeds and they return to thier postion.

I squirted some seafoam into the cylinders to cut some of the carbon. After a day of cranking and cussing I have now got compression of 68 psi in top and 75 psi in lower cylinder.

I have the carb off and quess I will order the new float tomorrow, maybe more parts if you all think the kit is the better way to go.

anymore ideas about my fuel delivery problem I would sure like to hear them. Its now a case of me against this dad gum thing! I may have to come out of retirement to pay for all the parts this thing may need!

 

[Woodstock60]

Re: Evinrude 1969 9.5hp fuel pump spring

Same thing did happen to me, went through 3 carbs. All worked fine on another motor, but wouldn't keep motor 2 running more than a few seconds. Tried everything, then I regapped the points......bingo, ran like a clock. Gap is critical. even if you think their good recheck.

 

[F_R]

Re: Evinrude 1969 9.5hp fuel pump spring

With all that fussing with the carburetor, have you ever thought about removing and checking the high speed orfice plug (main jet)? It sounds like it may not be clean. Clean is not good enough, it must be absolutely clean. Not even a hint of any gum or varnish in it. And don't go ramming wires and drills through it either...oversize is just as bad as dirty.