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Old 02-01-2011, 09:15 AM
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loose threads in fuel block,how to fix ?

I have an aluminum fuel block that I want to use,but some of the threads in it are loose. Once I screw the hose nipples into it I don't ever plan on taking them out. I was thinking about putting JB weld on the threads and screwing them in. Do you think that would work,or is there something better? Don't want to go the heli coil route and don't want to buy a new block.

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Old 02-01-2011, 09:21 AM
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IMO a fuel block is a poor place to trust an epoxy to keep sealed long term.

If the block large enough to go to the next larger pipe thread, I would go that route.
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Old 02-01-2011, 09:26 AM
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Forgot to mention--running Stromberg 97s so fuel pressure will only be 2--21/2 lbs
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Old 02-01-2011, 03:28 PM
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Right or wrong, I've done it. Prolly still not the best way.
Are they a NPT thread? you could make em straight threads and use Oring fittings.
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Old 02-01-2011, 03:43 PM
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they are 1/8 NPT and I already bought chrome fittings
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Old 02-01-2011, 03:50 PM
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It's highly unlikely JB Weld is going to seal fuel coming past threads. There are sealants specifically sealing pipe threads but if they are "loose" or damaged then it probably isn't going to help. Your best bet really is to return the fittings you have and move up to 1/4" fittings. Or buy a new fuel log.

You might be able to get it to seal for a while but you're just going to be sitting on a fire hazard waiting to happen.
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Old 02-01-2011, 04:08 PM
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JMO, I have tried JB weld around and on fuel fittings before and it will only last for alittle while then the fuel will start flowing back out again. Don't use it where fuel is involved IMHO.


Cole
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Old 02-01-2011, 04:32 PM
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Anything else out there that I could use?
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Old 02-01-2011, 05:59 PM
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Would pipe solider (sp?) and some careful heat work? I know, I know, not right according to Hoyle but it doesn't sound like political correctness is an issue. Might work, might not. Just another idea. Take it for what its worth.
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Old 02-01-2011, 06:27 PM
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Quote:
Originally Posted by yragat
they are 1/8 NPT and I already bought chrome fittings
Tap to 1/4 NPT and use a reducer to 1/4 NPT. Look around and you might even find a chrome one.
http://www.westmarine.com/1/1/3642--...1-4-x-1-8.html
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Old 02-01-2011, 06:28 PM
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sealant

Quote:
Originally Posted by yragat
I have an aluminum fuel block that I want to use,but some of the threads in it are loose. Once I screw the hose nipples into it I don't ever plan on taking them out. I was thinking about putting JB weld on the threads and screwing them in. Do you think that would work,or is there something better? Don't want to go the heli coil route and don't want to buy a new block.
If it will tighten up in the taper pretty good, put Permatex #1 on the threads and let it harden before use(24 hrs). At 2-3 psi IMHO it probably won't leak. olnolan
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Old 02-01-2011, 06:30 PM
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Weld them on. Thread them in, then weld around it.
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Old 02-02-2011, 08:59 AM
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Quote:
Originally Posted by cobalt327
Tap to 1/4 NPT and use a reducer to 1/4 NPT. Look around and you might even find a chrome one.
http://www.westmarine.com/1/1/3642--...1-4-x-1-8.html
This would be my suggestion also, but I would get fuel line nipples that have 1/4"NPT and not use any reducers.

Quote:
Originally Posted by OLNOLAN
If it will tighten up in the taper pretty good, put Permatex #1 on the threads and let it harden before use(24 hrs). At 2-3 psi IMHO it probably won't leak. olnolan
I have also done this method (I use sealer even with good threads). If the threads are not too bad this will work.

My overall first suggestion would be to make or buy a new fuel log. Use sealant on the pipe threads. You do NOT want any leaks in the fuel supply system.

FYI: Most fuel logs were made from a soft grade of aluminum and used 1/8" NPT. Often when the fuel line nipples were installed, they were done DRY and would leak as a result despite the tapered fit of the threads. Then the fittings would be overtightened in an attempt to 'seal' the leak. This would stretch the threads and cause a loose fit and would leak. When fitting tapered pipe fittings together, they should be snug with about half of the male threads still exposed. If a sealant has been applied to the threads, an additional 1/4 turn should complete the seal and not strip or over stretch the threads.
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Old 02-02-2011, 09:03 AM
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Quote:
Originally Posted by bigdog7373
Weld them on. Thread them in, then weld around it.
Since most fuel logs are aluminum and most fuel line fittings are brass, this otherwise good suggestion will not work.
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Old 02-02-2011, 01:36 PM
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Loose threads in fuel block

Quote:
Originally Posted by yragat
I have an aluminum fuel block that I want to use,but some of the threads in it are loose. Once I screw the hose nipples into it I don't ever plan on taking them out. I was thinking about putting JB weld on the threads and screwing them in. Do you think that would work,or is there something better? Don't want to go the heli coil route and don't want to buy a new block.
Holy buckets, a new fuel block won't break the bank, buy a new one, you can buy a T-style three outlet at speedway for $12.99 chrome, you can go up to $59.00 for some, but if you can't afford that, just for safety, then boy you are in the wrong hobby.

Fixing the one you have in parts and time would be more than 60 bucks, maybe you don't care if you drive around in a bomb, no pun indented, but the people with you or around you might.

Bob
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