1975 evinrude 9.9 fuel pump prob?

[scanman]

It's idleing really rough & only for a few seconds. I bypassed the fuel pump & still had the same problem, but the fuel was constantly flowing 'till I plugged the line with a screwdriver. Is this normal? Got good spark, new points, condensers, crank, pistons, rings, etc... Anybody got any ideas? I'm not sure if it's floodin, starving, or what. I'm at a loss at this point!

 

[bktheking]

Re: 1975 evinrude 9.9 fuel pump prob?

While the motor is running fuel should constantly flow from the fuel pump, well pulses of fuel that is. Sounds like the carb may need to be cleaned, is this a new motor to you or did it just start doing this?

 

[scanman]

Re: 1975 evinrude 9.9 fuel pump prob?

The motor wasn't running when the fuel was running out of the line from the pump. I've personally rebuilt the powerhead, carb, fuel pump, replaced coils, condensers & points. The only old part left in this motor is the driver & I have tested the spark to jump a 3/8" gap. This has to be something fairly simple, right?

 

[bktheking]

Re: 1975 evinrude 9.9 fuel pump prob?

Can you post a vid, need to hear it run.

 

[scanman]

Re: 1975 evinrude 9.9 fuel pump prob?

I can post one on u-tube tomorrow, It's dark here already. Any scientific wild guesses are most welcome!

 

[scanman]

Re: 1975 evinrude 9.9 fuel pump prob?

I can shoot a vid in the dark if it'll help.

 

[bktheking]

Re: 1975 evinrude 9.9 fuel pump prob?

It's just to hear it so giver gas (meaning go for it).

 

[scanman]

Re: 1975 evinrude 9.9 fuel pump prob?

ok, here's the vid: http://www.youtube.com/watch?v=_XQqQLZaxI4
Sounds good but just wont stay running. I've thinned out the "break-in" oil somewhat & the plugs aren't fouling. I noticed tonight that it runs a few seconds more since the air temp went down about 20 degrees tonight. Like I said I'm at a loss. I adjusted the carb float parallel to the carb body & the float drop to 1 & 1/4".

 

[bktheking]

Re: 1975 evinrude 9.9 fuel pump prob?

Ran out of gas by the sounds of it, when it starts to die did you try pumping the bulb. Willing to bet it`s all in the carb, did you put the clip on the needle and float. Sounds like the float isn`t dropping to allow more fuel into the carb.

 

[scanman]

Re: 1975 evinrude 9.9 fuel pump prob?

I did try to pump the bulb, to no avail. Tried a VERY SMALL shot of startin fluid & it died instantly (I know it's dangerous). Guess I'll re-adjust the float tomorrow. You think I should drop it or raise it. Is it the float level or the float drop that will fix it? they are two different adjustments. I'm thinkin the float drop may not be enough even though it was set by the specs in my sealoc manual.
BTW THANKS BK!

 

[bktheking]

Re: 1975 evinrude 9.9 fuel pump prob?

For these motor I flip the carb over and make sure the float is parallel with the body, no more to it. 2 things come to mind, is the float in backward or is it hanging up inside. To test- I drain the carb, flip it over and blow on the carb feed tube, acts as a "pop" off test of sorts. That clip has to be on the needle to the float, if you forget to install it sometimes the needle won't drop to allow more gas in.

 

[scanman]

Re: 1975 evinrude 9.9 fuel pump prob?

BK I'm sure that's good advice & I know me so I'll double check it in the mornin & post again ASAP with results, but I've been in the carb FIVE times since this problem started & I'm 99% sure it's parallel to the carb body & the float drop is also done by the book to fall between 1 1/8" to 1 1/2". I almost hope to find it's my mistake at this point & I ain't ashamed to tell yall what I find! Thanks again! Other than that I have NO IDEA!

 

[bktheking]

Re: 1975 evinrude 9.9 fuel pump prob?

I own a 76 15, had a 75 9.9, an 83 9.9, an 81 9.9 and fixed countless other ones, these motor I know the best out of all, I did what you did and completely rebuilt the 83. The float drop height isn't my concern, it's the question "is the float dropping" once the gas has been burnt. I think it's sticking but hey what do I know, I found a zip tie in my 76's reed plate and it was Rick who pointed it out. Jmendoza and Rick know quite a bit about them, the Machinist (Leeroy Wisner) wrote the bloody book about them.

 

[scanman]

Re: 1975 evinrude 9.9 fuel pump prob?

I've been all over Leeroy while i was rebuildin. He's The MAN! I saw the pic he has of a zip tie in the reeds. I'm startin to wonder if I got the reed gaskets correctly installed (as per leeroy) but he says if they're wrong it won't even give you a pop. I didn't mean to doubt ya BK. It's just that when I took my time & researched everything to make sure it was done correctly, it's hard to see what I did wrong (obviously something). I took over two months to do this using the correct sealants & procedures & only OMC parts & accs. My dad & I built several corvette & El Camino engines before he died so I'm no stranger to a torque wrench or proper procedures such as keepin rod caps aligned & such. I just can't seem to figure out where I screwed up & I desperately hope it wasn't internally. I sincerily hope I didn't offend you! Like I said I'll double ckeck myself in the morning & let ya know what I find.

 

[Will Bark]

Re: 1975 evinrude 9.9 fuel pump prob?

Looked at your vidieo and saw that your motor was doing the same thing my 77 Rude was doinf this summer. Mine turned out to be a weak fuel pump, wouldn't lift gas 16" up to the motor. I had checked everything out and still would die. New pump fixed it. This after reading LeeRoy a 100 times. How a pump gets weak without leaking fuel is beyond me. Can you move your fuel tank up to the level of the motor and see if that helps?

By the way, I'm just up the road from you in Hattiesburg.

 

[bktheking]

Re: 1975 evinrude 9.9 fuel pump prob?

Hell no , nothing said to offend. That ziptie was mine LOL, it's obviously some small oversight or it would be running. Will Bark makes a good point with the fuel pump, usually if you pump the bulb if the fuel pump were defective it would pick up speed again since you are manually pumping fuel into the carb however I've seen stranger things. You'd think when you sprayed a shot of ether into the carb it woulda picked up again. Maybe it's losing spark, did you test for spark after it dies, will it restart as normal and then stop again? Eliminate the stop switch, just throwing out ideas???

 

[scanman]

Re: 1975 evinrude 9.9 fuel pump prob?

First, Will Bark, I just moved down here from the Hernando area. You got any decent Crappie fishin up there?
ok, I bypassed the fuel pump & gravity fed it with an oil bottle & got no change.
Tried disconnectin the stop switch & that didn't help.
Spark has been consistent wether it is warm or cold & I've been through several sets of new plugs, not sanded or cleaned.
This vid is a bit more inclusive, showing how it acts after the temperature comes up: http://www.youtube.com/watch?v=WErdYnvcZjk. Sorry for the delay, my cameraman & u-tube expert just got home from school, LOL!
This is a short vid of the carb:http://www.youtube.com/watch?v=p8VeCo9aQBo. There are also a few pics below. Wonder if an offset or "Z" bend in the float tang would help & should I raise or lower it? Could it be flooding? The ether killed it quick!
Will Bark, do you still have that old fuel pump? Was it from a 9.9? Since the diagrams & instructions are not specific to each model & year I might like to have it for a pattern to make sure I built mine correctly.

 

[bktheking]

Re: 1975 evinrude 9.9 fuel pump prob?

Did you build the fuel pump with a kit? I think you did according to your post, the OMC kits come with very specific instruction on how to do it, IMO rebuilding these pumps is a nightmare.


http://www.sschapterpsa.com/ramblings/Rebuilding_fuelpump.htm

Read step 23 to test.

I still don't think it's the pump however. When you prime the bulb on any motor it fills the carb. You can disconnect the fuel line and run the motor for at least a minute without a tank connected, fuel pump or no fuel pump. It's a 75 motor, points and condensor. They are known to have slop in the magplate, have you checked the mag plate for lateral movement. If you were closer I'd let you try mine LOL. What happens when you take it off idle and rotate the throttle. If it were lacking fuel spraying 50:1, ether or carb cleaner would make it pick up again which it simply isn't doing, it's almost as if timing is shifting causing it to die, thoughts?

 

[Will Bark]

Re: 1975 evinrude 9.9 fuel pump prob?

First of all, welcome to South MS. The best crappie fishing I know of is at Flint Creek up in Wiggins; I mostly fish the saltwater down your way putting in at Tucies or Mary Walker.

This is I know is a stupid question; but when you rebuilt the carb, you did pop that welch plug and clean out the little holes underneath it? I used a piece of fine wire (one strand) out of a lampcord to make sure that no gum or varnish was clogging them up. Those are part of the idleing set-up.

Since you gravity fed the motor without using the pump I don't think your pump is the problem; but what do I know. I wish I had seen this thread earlier but I threw the old pump away; wife says I collect too much "junk" so I pitched it. I'll look thru my other "junk" boxes to see if I have another one and let you know.

 

[Will Bark]

Re: 1975 evinrude 9.9 fuel pump prob?

Scanman, if you have'nt done so already Google up "LeeRoy's Ramblings" and go to outboard questions then go to 16OB on carbs and fuel pumps he has really detailed instructions and pictures on how to rebuild the pump