1975 evinrude 9.9 fuel pump prob?

[dazk14]

Re: 1975 evinrude 9.9 fuel pump prob?

I would be careful with that grease. If it makes its way into the jet chamber you could end up with a carb problem that wasn't there before, in my opinion.

That is why I instructed scanman to ONLY put it on the threads os the mixture needle.Most doesn't make it into the tight fitting carb side threads, just enough to seal it it works well and you'll never have a stuck needle.

 

[billsfw]

Re: 1975 evinrude 9.9 fuel pump prob?

Sounds to me that you have an air leak, clue, runs till it gets warm. Start it cold and spray carb cleaner around the case and carb mounts and see where it sppeds up. Then fix that.

 

[scanman]

Re: 1975 evinrude 9.9 fuel pump prob?

dazk14, I understood ya. I'll be light with the grease & like I said, I hope it works. That needle's kinda stiff anyway. Sounds like a cool trick. I didn't think of it!

Billsfw, I called myself tryin that air leak detection thing. It's a trick my dad taught me way back when... Anyway I didn't really get any positive change from the spray around the carb. Maybe I should try around the block to see if there's a leaking seal somewhere. I've got it all loaded up for tomorrows road trip, but I'll take some of the appropriate chemicals with me so we can try it. Thanks for your time & expertise. I can't tell ya how much help everyone has been!

 

[Will Bark]

Re: 1975 evinrude 9.9 fuel pump prob?

When scanman gets back (happy) he'll tell you all about the time we had with it. It doesn't make sense to me still why it didn't work but I'll let him do his report. Glad you made the effort to come up here and I enjoyed the whole time even if we were out in the sun!

 

[Fed]

Re: 1975 evinrude 9.9 fuel pump prob?

I like the sound of (happy)
Hurry up Scanman!

 

[scanman]

Re: 1975 evinrude 9.9 fuel pump prob?

Well here goes! There are way too many people on this thread for me to thank you all! It would take longer than it has to troubleshoot this motor, but I'll say that for as long as I can, I'll be helpin people via these forums! Bktheking, you even offered to ship me your parts to try on my motor! Fed, sorry bout your nightmares, bud & OptsyEagle, all your atteneion to this thread was wonderful. I'm very gratefull to you all! You may have restored a bit of my faith in humankind!

I never figured to meet anyone on the internet that would honestly invite me over to thier home to cannibalize thier running 15hp electric start motor, to fix my extremely heavy & expensive ANCHOR! I'm overwhelmed by Will Bark's Kindness & hospitality!

We swapped the fuel pump, no change. We ran a compression test: Cyl #1(90psi); Cyl #2(92psi). We tore my carb down together on Will's workbench & found nothing! I was about to leave when he said "Are you sure you don't wanna try swappin those carbs?" After convincing me it was not a problem, we installed his 15hp carb on my motor & it started & ran just like a new motor! I couldn't believe it! I think I turned several cartwheels! We still don't know what in the world is wrong with mine, but at least I know what to do next. Happy just doesn't cover it. I also insisted that we crank & run his motor before I left, just to make sure I didn't screw anything up.

If I need to start a new thread, someone say so & I will, but here's what I'm thinkin. The 15hp carb is NLA at evinrude, & there's no sense in buyin a 9.9hp carb if I gotta buy one, so... Wonderin if I can buy a 15hp carb body(still available new for only $60.00) & a 15hp main jet for it too, then put my parts & rebuild kit with it. Will this work? Will I have to buy a different needle valve too? Just tryin to go with new stuff instead of someone else's used headaches from e-bay. Opinions, please.

YAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAYYYYYYYYYYYYY!!!!!!!!!!!!!!!!!!

Now I know where to start even if I don't know what happened! Anybody know how to get those lead shots out & back into that carb body?

 

[bktheking]

Re: 1975 evinrude 9.9 fuel pump prob?

Uh hum- post #9 which leads back to post #2 CARB!!!!

Willing to bet it`s all in the carb

glad it's workin for ya! I have a 15 hp carb but the seat is stuck in it bad, it's junk.

 

[Fed]

Re: 1975 evinrude 9.9 fuel pump prob?

That's great news Scanman but it begs the question, exactly what's wrong with the carb?
I bet you're happy to see higher compression numbers too.

 

[OptsyEagle]

Re: 1975 evinrude 9.9 fuel pump prob?

Glad to hear you got it going. Good luck on the carb. I can't advise you on your suggestion but want to add that if you go to the Evinrude Parts Diagrams and check, the 1975 15Hp used a different throttle cam (320819) then your 9.9Hp (320434). I don't know what, if any, difference it would make but they are slightly differently designed and I have to assume that they would have an effect on your ignition advance. Perhaps you could get another one of those, if available.

http://epc.brp.com/SiteMods/BRP_Pub.../Index.aspx?BRANDS=EJ&LANG=E&DEALERLOCATOR=NO

Another thing, if you are looking for entire carbs, is that I think Evinrude made about 6 times as many 9.9Hp then 15Hp motors and I would assume that would mean there would be that many more 9.9Hp carbs then 15Hp ones.

Good luck all the same.

 

[Will Bark]

Re: 1975 evinrude 9.9 fuel pump prob?

scanman, somewhere in LeeRoy's ramblings he touches on the two differences between 9.9 and 15 carbs; one obivously the throat size and I think(don't know) is the high speed jet size with everything else being the same so low speed should fit, float and bowl same. I'm going to re-read a few of his parts tonight; if I find it I'll shoot back to you here. Also, there at the end of one of his pieces is a "contact LeeRoy" button you may be able to directly ask him because he for sure would know.

 

[bktheking]

Re: 1975 evinrude 9.9 fuel pump prob?

The jet size is different as well as the throat, the 15 has a larger jet for obvious reasons. The 15 carb is hard to come by. Going back to the old one, the kits ship with the little plastic seat that sits in the end of the low speed port for the needle seat. I personally have never changed one cause I don't know how to get it out. It's possible that yours is buggered. Anyone have any feedback to this suggestion? Is that even what the plastic piece is for?
LOL

 

[Joe Reeves]

Re: 1975 evinrude 9.9 fuel pump prob?

When you get tired of using that carburetor for a paperweight, and if you're willing to foot the shipping bill, I'd be interested in tearing that thing apart for inspection and rebuilding. There's very little that can go wrong with that thing.

 

[OptsyEagle]

Re: 1975 evinrude 9.9 fuel pump prob?

I get them out using a #8 deck screw. I screw it in until it just bites into the bearing and then pull it out, making sure not to touch the end of the carb. Steel screws on aluminum carbs can be fatal. I lubricate the canal with seafoam so that it slides out easier as well.

I think I ask him about the bearing and he did say that he replaced it. I would ask if carb spray was used after it was put in there, since I have heard it can be hard on the plastic pieces. Plus if for some reason he screwed in the needle to hard it could also deform it. Possibilities. It does seem now like it is his slow speed carburetion.

 

[scanman]

Re: 1975 evinrude 9.9 fuel pump prob?

Bktheking, Uh hum... looks like you got the first cookie! Glad you're still with me, bud. I re-read posts #9 & #2. Will & I pulled the carb, keepin it level, & the bowl was completely full. We measured the float drop to be 1-3/8", right in the middle of the recommended range in the OMC manual. It seems that, for whatever reason, the carb isn't pulling fuel from the bowl into the manifold. I blew compressed air through all the passages (I think) & ran a piece of wire through all the ones under the soft plugs. How many times, I don't even remember. I bet I can get that carb off faster than anyone! I've never seen the 15hp carb kit or the seat you're talkin bout, unless it's the same one that comes in the 9.9 kit, for the mixture needle. The local dealership mechanic says he never installs them, that the needle seats well without 'em. In fact he gave me four spares outta his toolbox! What "seat" is stuck in the carb you have? I might need it anyway, 'cause I have my "ways" of gettin things unstuck. I'd probably like to have it!

Fed, HE77 YEA, the compression numbers were a GREAT relief for me. Confirmed my work on the internals & the "opinion" of the local machinist about not really "needin" to go +0.10 on the bore & rings! I also learned to beware of the length of the threads of compression testers. Not all of 'em will fit inside these little motors!

OptsyEagle, I'll continue to check on the details, but thanks for pointing out that difference in the throttle cam. I looked at different year models a bit before that last post, & it can get REALLY confusing. At least I don't have to worry much about winterizing down here. I'm still wantin to FISH! I will, most likely, buy an entire carb, but I'll go with the 15hp, if I can find one, cause it's the only big difference in the two motors. That & a prop & I'll be FLYIN THE BAYOU!

Will Bark, If you find that link to contact Leeroy, Please forward it. I don't think I ever saw it, as many times as I have viewed his links. I also thought I saw a pic of the two carbs from the "down the throat" view & I couldn't find that either. I think I'm just really tired.

 

[bktheking]

Re: 1975 evinrude 9.9 fuel pump prob?

I've never replaced it either , however in this case nor have you. Like opsy said, could be deformed. You can have the 15 carb, i'll take a pic tomorrow, I cut the top off the seat with a hacksaw and managed to break an ez out off in the hole, I sorta knew it was toast so i didn't care. It's yours if you want it. Or you could send it to Joe, i'm sure he'd fix it up or at least figure out what the deal is. Could also be a split in the emulsion tube you just can't see.

 

[scanman]

Re: 1975 evinrude 9.9 fuel pump prob?

I did replace that needle seat several times cause I needed to use the "trial & error" method to get one to sit properly in the canal, but it's possible that I ran the needle through it, cause, with the new needle retainer, it's really stiff to turn & I had a hard time tellin when it was "lightly seated" like the OMC manual said. I do know how to get 'em out, though. Leeroy told me, I think. Pics would be great & I'll certainly pay shippin. If I can't get it, maybe Joe will help out, but I'd like to try it first. STUPID PRIDE!

 

[AlTn]

Re: 1975 evinrude 9.9 fuel pump prob?

Happy to read of your success Scanner, and Will's generosity!...can identify with that needle retainer comment as I put the needle in a vise and turned the carb body in order to get it in the canal, no chance of that thing ever vibrating out!...seems like boatparts.net had a part no. for a 1978 9.9 carb that was for a 15hp....not sure as I saw it a couple of weeks ago and I've got CRS. I know you're relieved to finally diagnose the problem..best ot luck going forward.

 

[jmendoza]

Re: 1975 evinrude 9.9 fuel pump prob?

Good lesson for all here. The clues were it started without the choke when cold, then gradually got worse as it warmed up, then died at idle, but would run at higher speeds. All of the symptoms point to an overly rich low speed circuit.

 

[scanman]

Re: 1975 evinrude 9.9 fuel pump prob?

That carb has GOT to be clogged up somewhere, but I can't imagine where!

 

[Will Bark]

Re: 1975 evinrude 9.9 fuel pump prob?

scanman, if you unscrew the low speed needle out and put the straw on the carb cleaner down there tight and gun the cleaner thru it does it spray out of a tiny hole just behind the throttle plate towards the motor? Remember, I had to give it a little choke after it started and the RPMS would pick up? Maybe that little hole still has some varnish or gum in it.:redface: No luck on the direct contact to LeeRoy yet.