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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: beemuker on April 25, 2018, 05:35:54 PM
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Started the brick after putting in fuel. Only filled it about 3/4 full. smelled gas. back of engine wet and fuel dripping onto rear cyl exhaust header. looked and felt around but can not see or feel where it's coming from. I don't think it's the tank, and the hoses I can see looked dry. I searched and saw an old post with this "I fixed the fuel leak last night. The vacuum hose that runs to the bottom of the fuel regulator, the one covered by a wire spring, was split in half where it made a sharp bend going into the bottom of the regulator."
This may be my issue, but the pushing the spring back, the end I can see looks fine. any other thoughts on how to track down my issue. ? Do I need to drain the tank and remove to get to this?
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If it leaks fuel out of the vacume hose you need a new FPR.
The the membrane is kaput...it should be fuel on one side, air on the other.
Check also the other hoses, it could be that the leak is elsewhere and the fuel just follows the vacume hose.
Remove the bottom of the airfilter housing for better acces.
With a split vacume hose the engine also should run like crap at idle and light throttle opening.
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If it leaks fuel out of the vacume hose you need a new FPR.
The the membrane is kaput...it should be fuel on one side, air on the other.
Check also the other hoses, it could be that the leak is elsewhere and the fuel just follows the vacume hose.
Remove the bottom of the airfilter housing for better acces.
With a split vacume hose the engine also should run like crap at idle and light throttle opening.
thanks, it runs and idles fine. so maybe I need to look elsewhere. can I get the air filter housing out without removing the tank?
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Feel along the rear seams of both sides of the fuel tank, too, and the fuel sender plate. It might be leaking. You should be able to lift the tank from the rear to check those items. Be mindful of the left-side fuel hose attachments.
Removing the tank is relatively easy‚ at the most, four hoses, the four-pin connector and two clips to remove. A full tank weighs around 35 lbs.
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can I get the air filter housing out without removing the tank?
Yes, you only need to remove bottom half (top half is a whole lot more work because of the wires to the AFM).
It's two allen screws inside....you need small hands, a 1/4" short ratchet and a extension of correct length.
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tried to track down the leak.Couldn't see any gas when on center stand, but leaks when on the side stand. propped the tank up and took the coil cover off. still can't see where it's coming from. hoses look good ,doesn't seem to leak from tank ,but gas on back of engine dripping down to exhaust manifold. .that tiny link is a pic. don't know why it's doing that.
update, peeking from the other [r] side, I can see gas on the engine around the throttle bodies. still don't know where it's coming from.
https://drive.google.com/open?id=1bos (https://drive.google.com/open?id=1bosbTJyO1TURi23MpIo9TnD7f37pAKVc)
https://drive.google.com/file/d/1n5GHt6snzKvexOYEzdZFw1AZP1G9dJBd/view?usp=sharing
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Yes, you only need to remove bottom half (top half is a whole lot more work because of the wires to the AFM).
It's two allen screws inside....you need small hands, a 1/4" short ratchet and a extension of correct length.
wow, you must have small hands, I can't see there being enough room at the top to get it out.
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. . . I can't see there being enough room at the top to get it out.
You can't get your hand in there with a wrench once you remove the air filter? It's one of those jobs like removing the pump or fuel filter. Sometimes you need to recruit someone with hands for the job; otherwise, more disassembly will be necessary.
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got the bottom of the air box out, and there was gas pooled up under it. the line coming from the front of the tank was loose enough to pull off where it goes into the little can [fuel regulator?]
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You can't get your hand in there with a wrench once you remove the air filter? It's one of those jobs like removing the pump or fuel filter. Sometimes you need to recruit someone with hands for the job; otherwise, more disassembly will be necessary.
yes, once I figured out I had to get the filter out,it was a piece of cake.
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got most of it back together and fired it up ,no pun intended. leak seems to have stopped. thanks for the help. I guess the original clamps loosened up or the hose shrunk, but all seems well for now. I'll order a new hose and replace it next time I have to go in there, but the original seems fine for now.
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It can be a pain to keep the big flat washers in position when you replace the lower housing. Either glue or tape the washer to the lower housing. Your neighbors will appreciate the lack of cursing and screaming, as the washers refuse to stay in position. :hehehe
Regards MTU.
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It can be a pain to keep the big flat washers in position when you replace the lower housing. Either glue or tape the washer to the lower housing. Your neighbors will appreciate the lack of cursing and screaming, as the washers refuse to stay in position. :hehehe
Regards MTU.
haha. Yep.I put grease on one to keep it in place.