Don't break your fuel pump, there are consequences

[just plain ole Bill]

I'm trying to sort out fuel pumps for an Evinrude 65273S. According to the BRP drawings I should have a 0385784 which crosses to a 438559. Again, according to BRP drawing the top screw threads into the body. Had my pump rebuilt and the one I got back has a through the body mounting screw on the top. (I had broken the centre plastic part:redface: on my pump.) I purchased a used 438559 from a different source and it also has a top through mounting screw. Checked out BRP drawings and 65hp through 150hp motors use the same p/n pump, same top body threaded screw as my original pump. Looked at the 50hp fuel pump and it has a through hole on the top. Problem is BRP uses the same part number for all these pumps. There is however a part number for the top mounting screw for the 50hp pump that does not show up on the pump drawing I think I'm supposed to be using????

Can anyone tell me if the two pumps are interchangeable

 

[F_R]

Re: Don't break your fuel pump, there are consequences

So, what your are saying is that there are no threads for the top screw, right? How about it, is there room behind it for a nut? I would assume it leaks without the top screw being in there?

If everything else is the same other than that screw and you can nut it, I would say it surely should work.

 

[jtexas]

Re: Don't break your fuel pump, there are consequences

And the two bottom corners are also mounting screws, too, in addition to the one on top? no matter, just mount it wherever you can find room for it, one screw, two screws, three screws, right side up, upside down, don't matter. I'm with FR, just put a nut on behind whichever mounting screws don't match up to a bolt hole. Can't find a matching nut, any bolt of similar diameter will do.

 

[just plain ole Bill]

Re: Don't break your fuel pump, there are consequences

I 'nutted' it when I installed it. The rest of the story...Put it on the muffs to check it out and discovered I had water in the fuel. Pulled the carbs and cleaned them, reinstalled, drained/flushed fuel system, installed new plugs, added some B12.

Filled bottom two cylinders with fuel when I primed it. Got past that, (crud under needle valve) seemed to start and run OK on muffs. Went to the lake and it seems like it floods/difficult to start. GPS indicates top speed of 17.2MPH. Before I changed the fuel pump it was topping out at nearly 22MPH. Was hoping someone could tell me whether the pump I installed is correct or maybe I screwed something up with the carbs.

 

[just plain ole Bill]

Re: Don't break your fuel pump, there are consequences

You posted while I was doing the slow typing thing. I'll assume the pump is OK and go back to what I did with the carbs. Thanks Guys!!

 

[jtexas]

Re: Don't break your fuel pump, there are consequences

are you getting a hi-speed misfire?

 

[just plain ole Bill]

Re: Don't break your fuel pump, there are consequences

No. It seems to run smooth. It just won't 'hurry' like I think it should or used to. I should add that it is a motor that was laid up for about 4 years. I've been working through the FAQs and other passages up to this point. I just felt like I lost a lot of ground when I replaced the fuel pump.

 

[jtexas]

Re: Don't break your fuel pump, there are consequences

when the fuel pump can't keep up with demand, carb bowls start to run dry, it starts coughing, hicupping, acting like its running out of gas.

I'm as sure as any do-it-yourself outboard owner can be that the pumps are the same - that plus $10.69 will buy you a cup of coffee at starbucks.

atsa lot of lost speed - are your carb butterflies parallel, and horizontal (not beyond) at WOT?

 

[just plain ole Bill]

Re: Don't break your fuel pump, there are consequences

Of course you're correct about the sputtering at higher speeds. It's as plain as the nose on my face. Which, case in point, I don't always see 'cause I'm looking somehwere else.

I'll have a look at the butterflies first opportunity..and well before I start tearing into something else. This time I'll try and bring my nose along!

 

[just plain ole Bill]

Re: Don't break your fuel pump, there are consequences

It's magic....Finally got around to checking on this problem. Found I had an overlay with a carb line and the main line to the carbs then squeezed them together with the air baffle (name??) cover when I worked on it last. Got quite a surprise when I next went out to test it when I dropped the hammer on the throttle! It was a pretty windy day and I managed to empty the glove box contents onto the floor of the boat. :eek Thanks for your inputs!!

Just realized I missed an opportunity for an entry into the Stupid Human Trick thread!