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Honda BF 100 fule coupling leak

N

NaymzJaymz

Contributing Member
Hello. We have a Honda BF100 with a fuel coupling that gushes fuel out when the fuel line bulb is pulsed, even when I'm holding the coupling against the motor. We bought a replacement coupling, and it got even worse. It's a coupling with two "pins", one for gas and the other a locking pin. We've had the boat out twice since we bought it, and it's gotten worse. The engine shuts off for no reason, but when I keep the fuel line pressure tight by ocasionally squeezing the bulb, it runs perfect. After the motor is running the leak slows and then stops. I think it's a early 90's motor with a blue and white paint scheme. Was there some king of gasket present that fell off? I don't think so. To you experienced people this probably seems like the dumbest problem, but this is the first boat we've ever owned. Thanks so much for any help you can give us.--James
 
Noticed that noone is attempting to answer this one. So here are some thoughts...

There is an o ring in the fuel line connector but not the one on the engine.

First check to be sure you purchased the correct connector for that engine. There are several connectors that look the same and seem to fit, but are just enough different to cause leaks (evinrude, some mercury, and even yamaha).

The latest part number for the proper fuel line connector is 17650-921-003ZB.
If you have the right connector, then there may be a crack or other problem with the fuel connector on the engine. Unfortunately, it is not available anymore. I do not know of any replacement.

It might be possible to somehow use an early 8 HP connector. 17710-881-840ZB. It will work with the fuel line connector that I listed above. But, I do not know if it will fit in the motor.

As an alternative, you could just remove the fuel fitting in the engine and run the fuel line directly into the engine and connect it directly. At least this way, you can see if the connector is causing your running problem.

If you connect directly and still have to continuously squeeze the bulb for the motor to run, you could have a breather in your tank not open or you could have a bad fuel pump.

Mike
 
Even if you have the correct connector, I've had to bend the latch locks on the new replacements that are being sold today to get them to stay coupled reliably. The locks are made out of some flimsy metal clips and the whole replacement part industry these days is turning out some pretty cheap junk.

If you do have an issue with the connector on the motor, it is most likely that there is wear on the "valve depressor" (for lack of a better term) that keeps the check ball on the tank side open adequately for fuel to flow. Or, the "ridge" that the fuel line connector latch grabs is worn down enough so that your connector won't stay latched tight. As Mike (hondadude) points out, they are no longer available but you can retrofit with one of the new style and use the matching connector on the end of the fuel tank line.
 
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Hey Mike,
Thanks for the great response. I'll heed your advice. There's a respected outboard shop in our area that's a Honda service center. Maybe they'll have a replacement coupling that is better than the one I bought at Walmart(although it did say it was for Honda's). I probably wasn't opening the gas tank breather enough, so you probably solved that problem for me. That's amazing that you have those part #'s. Thanks so much. The coupling that's leaking is probably the original one as the Honda logo is on the hose assembly. I'll probably post some more questions about this motor in the future in hopes of getting opinions from knowlegable people like yourself. Thanks again, Mike!

James.
 
And thanks to you for your help, jgmo. I will use this advice, and maybe I'll just rig a new coupling system of some type if I can't solve the current connector issue. Mike suggested simply bypassing the connector and going right into the motor. Thanks again-----James.
 
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