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post #1 of 25 (permalink) Old 08-11-2019, 10:18 PM Thread Starter
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new and exciting failure

Sorry it has been awhile since I have posted, but I thought I would come back in with a good story. I had to go to work this morning to see an emergency patient, and I thought I would ride one of the bikes. I have recently been cleaning and polishing the 72 Bonneville, so that got the nod. Well, The ride started off well and the bike was cracking along, and then started sputtering. I had checked to see if it had enough fuel before I left, and it did, so I checked the fuel taps to be sure they were on. They were, but I just did a quick, cursory check. Well, I ride on, and the bike is still sputtering. Finally I look down and see...........the fuel line spigot has come unscrewed from the tap and it is pouring gas all over the engine and me! It emptied the entire petrol tank before I could get it stopped. I only had a couple of miles to go, so I made it to the gas station. The worse part was that the gas made the bike a mess. Washed all of the lube off of the chain and spread it over the bike. I was annoyed, but that is life. The old girl likes to try and destroy herself every once in awhile by way of vibrational suicide. She can cause me untold misery at times. That being said, when that bike is running right, there is nothing better. I have ridden plenty of other bikes in my time and own several, but that one is the best. It is fast enough, handles well, stops poorly, and sounds amazing. Anyway, it's good to be back on the forum. Look for a lot of posts from me, as I have been up to a lot lately. Cheers.
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post #2 of 25 (permalink) Old 08-12-2019, 12:53 AM
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Thank God the bike and you didn't catch fire!
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post #3 of 25 (permalink) Old 08-12-2019, 01:37 AM
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From what you wrote it is obvious that you don't appreciate the gravity of the situation you were facing. I would say that you had a guardian angel riding with you today. Dumping fuel over a running engine and your clothes can result in an unpleasant religious experience. About 30 years ago one of the guys in our club had a leaking petcock.

Results were after the explosion it took 48 hours for the body ID to be confirmed. Just something to think about.


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post #4 of 25 (permalink) Old 08-12-2019, 03:06 AM
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I had a fuel tap crack in half when out riding. One of the cast alloy ones being sold everywhere. The threaded portion that goes into the tank. Stopped and had to just let the petrol go. Yes, it is an experience, i noticed my leg getting wet so stopped pretty quick !
My pipe unions are usually sealed with Hylomar so have not unscrewed yet.

Now,where did that bit fall off ?
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post #5 of 25 (permalink) Old 08-12-2019, 04:27 AM
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Originally Posted by rambo View Post
I had a fuel tap crack in half when out riding. One of the cast alloy ones being sold everywhere. The threaded portion that goes into the tank. Stopped and had to just let the petrol go.
The T160 I bought second-hand came to me with a pair fitted. The reserve tap broke off exactly the same. Luckily I was outside the house, stuck my finger over the hole in the tank, yelled 'til the girlfiend came out to see what all the racket was about, she grabbed an empty fuel can and we managed to spread much of the fuel around the other bikes. Nevertheless, skin and especially clothes penned for days afterwards ...

Daft thing is, because the Co-op fitted those taps for a year or two, now people will pay money 'em ...

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post #6 of 25 (permalink) Old 08-12-2019, 06:18 AM
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better off with the nickel/chrome coated brass ones IMO, those cast alloy ones were always prone to fracturing...we all learned the hard way years ago. Some like Stuart were lucky, mine was when fitting them after a paint job so it was also lucky. Others, not so lucky.

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post #7 of 25 (permalink) Old 08-12-2019, 07:07 AM
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Some types of fuel hose hardens with age/fuel contamination, the clear braided hoses are particularly prone to losing their flexibility.

Vibration from the engine can be transmitted along a hose that has hardened and find a point where fatigue can be induced, this is likely to be the stress riser caused by the thread where it screws into the tank.

It is worthwhile to replace all fuel hoses that have hardened.


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post #8 of 25 (permalink) Old 08-12-2019, 08:39 AM
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I had the same experience with a sputtering engine. I pulled over and found fuel pouring out one of my MK II. The bottom plug/trap came out because I failed to tighten it properly is my guess. I was in a 30 mph zone and rode for a quarter mile to a gas station, saw the problem, shut the fuel lines off and luckily the plug stayed on the engine case when it fell out! And indeed, this can be a very dangerous situation. I felt very fortunate ...
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post #9 of 25 (permalink) Old 08-12-2019, 12:16 PM
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Similar thing happened to my when I was living in Australia many years ago. Riding at speed I felt my leg getting cold and the engine started missing. I pulled over to find the original factory tap was leaking and fuel was all over my leg/boot, the engine casing, gearbox, rear wheel etc. I never really got rid of the smell from my leathers but could have been much worse.

Any photos of the cast taps please? I want to check mine as the PO fitted both last year.
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post #10 of 25 (permalink) Old 08-12-2019, 02:18 PM
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Hi Ian

Originally Posted by Boggie View Post
photos of the cast taps

The offending part numbers are 60-7266 and 60-7267, they first appear in the late '79 parts book (99-7102A) and are still illustrated/listed in the '82 T140V/TR7 book but not in the TSS or TSX books, those showing the superseding Paioli taps.


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