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Fuel line on 91 Ski |
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NGP 
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Joined: October-27-2014 Location: Alabama Status: Offline Points: 23 |
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 Topic: Fuel line on 91 SkiPosted: July-07-2016 at 4:43pm |
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Last year I had my carb rebuilt on my 91 ski.
Ordered and installed brass PCM fuel line from pump to carb. Noticed this weekend that it was leaking at the carb bushing and line. Put the line wrench on it and it stopped leaking. I checked the carb later and it was leaking again, this time I tightened up a little to much  that's right stripped out also noticed leaking at the pump. I know the stock line works or they wouldn't put em on but...Could you put a steel braded fuel line with correct anodized fittings on it to reduce the chances of vibration loosening the lines? Just a thought, Lake was rough.. Sorry for the long winded post Thanks for any help |
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NGP
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Posted: July-07-2016 at 4:47pm |
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I'm pretty sure the lake being ruff didn't have a lot to do with. I'm a Newbie obviously
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Hollywood
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Joined: February-04-2004 Location: Twin Lakes, WI Status: Offline Points: 13514 |
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Posted: July-07-2016 at 5:24pm |
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What was wrong with the old line? Sounds like you didn't quite bend the new one to fit properly. I've never heard of rough water loosening up a properly fitted hard fuel line before.
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JoeinNY
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Joined: October-19-2005 Location: United States Status: Offline Points: 5698 |
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Posted: July-07-2016 at 6:00pm |
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The reason that line is a hard line is because should you have a fire under the engine compartment it is important that a pressurized fuel line not easily burn through (or wear through by rubbing causing the fire) so you have time to either extinguish the flames or swim away far enough to enjoy the show. There are flexible fire rated lines available – I think n3 sells one – and some dedicated law breakers have been known to go with a high quality but not exactly fire rated AN line and fittings. Some just get steel brake line and fittings and make up their own. Whatever you do make sure it is well secured and will take long enough to burn through that you and yours won’t still be on board when it does.
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NGP
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Posted: July-07-2016 at 6:02pm |
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Thanks for the reply Hollywood
The nut on the old line at the carb was nearly rounded off. That's the reason for the new line after carb rebuild. I didn't know that I needed to bend the new line looked pretty close to the old line to me. I called my self reinstalling correct, I guess not to though. I do remember however that it was a pain to tighten up bushing in carb on account of a black plastic piece on base of carb. Excuse my ignorance on not knowing what that part is . I. Thought maybe a braided line with anodized fittings might be easier. |
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81nautique
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Joined: September-03-2005 Location: Big Rock, Il Status: Offline Points: 5779 |
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Posted: July-07-2016 at 6:05pm |
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So you bought a steel fuel line with brass fittings. What stripped out? the brass fittings on the fuel line or the carb inlet?
Are you sure the initial leak was the brass fitting to the inlet or was it the inlet/screen housing itself loose? This is common if you don't get a wrench on both fittings when installing the new line. You may also need a new gasket there as once they start leaking they seem to never stop no matter how many times you tighten them. 
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NGP
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Posted: July-07-2016 at 6:05pm |
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Thanks for the reply Joe
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NGP
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Posted: July-07-2016 at 6:24pm |
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Alan, the hose I bought was the pcm hose not sure if it was steel or brass, I'm almost positive on brass fitting At any rate It was a "solid" line. As for what's stripped couldn't say for certain. I'm assuming it's the bushing at the fuel inlet where fuel line screws in. When I return home I will find out. I had two wrenches on it when I put it on and to my knowledge it didn't leak last season. With that being said it might've not been tight enough just seems like I would've noticed a leak. I didn't think about the inlet gasket .
Thanks for the help. |
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8122pbrainard
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Posted: July-07-2016 at 6:32pm |
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Nicholas,
I have a feeling the leak is at the adapter on the carb and not the inverted flare fitting on the line. It's the reason Alan posted the picture of the gasket between the adapter and the carb. Here's what happens: When you tighten the fuel line flare fitting, it winds up the line in a clockwise direction. Now with the vibration of the engine, the line wants to go back to it's original position, does so and unwinds/unscrews the adapter. As Alan mentioned, double wrenching is a must but also lubricate the flare nut where it meets the fuel line but not the actual flare surface. Then when tightening, the fuel line will not wind up but slip in the nut. |
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NGP
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Posted: July-07-2016 at 6:44pm |
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Thanks Peter.
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81nautique
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Posted: July-07-2016 at 7:38pm |
Yup, That's what I was getting at, it will do it every time. Also those gaskets have a very thin coating on them and once tightened a few times the coating gets scratched off and they just won't seal. I always carried an extra in my toolbox. No Toolbox comments GARY 
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Gary S
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Posted: July-07-2016 at 9:05pm |
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NGP
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Posted: July-07-2016 at 9:36pm |
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Thanks for all the help
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8122pbrainard wrote: