QuestionI have a 1999 Honda 750 Nighthawk and when I went to start it a
few days ago, gasoline poured out somewhere between the two
inner carbs. Can't find the exact location but the gas only
pours out when the engine is running. A puddle on the ground
about one foot in diameter in just a few seconds.
Also found a length of black fuel tubing sticking up with a
hose clamp still connected on the end. Could not see where the hose was supposed to be connected BUT, I started the engine thinking fuel would pour out the end of the tubing but it didn't.
So now I still have a major fuel leak and a disconnected hose
that I don't know where it goes.
Any suggestions?
AnswerRichard, It sounds like either the fuel line that feeds the carburetor rack fittings has a hole, is loose/broken at the fitting or the fitting has broken, where the o-rings connect it all together.
http://www.cmsnl.com/honda-cb750-nighthawk-1999-usa_model7236/partslist/E++1801....
Look at the fittings where the #1 o-rings fit. This is the fuel rail feed that connects the carbs together so one fuel line feeds the whole rack. You are going to have to pull the seat and fuel tank to see exactly what you have to deal with in there. If the T or other interconnecting fuel fittings are leaking/broken, the whole carb rack has to come off, be separated from the mounting plate, so you can jiggle the parts apart, replace what is broken and install new o-rings before reassembly. You will probably have to buy 4 sets of packing kits to get enough o-rings to refit the carbs. While you are at it, clean the carbs/jets and replace all the o-rings that come with the kits. That way you are good to go for another 12 years.
http://www.cmsnl.com/honda-cb750-nighthawk-1999-usa_model7236/partslist/E++18.ht...
Check the condition of all fuel and vacuum lines when you have it all apart. Replace as necessary.
These fuel tanks have a vacuum petcock assembly that can experience a failed diaphragm, which will cause air leaks into the motor and shut down the fuel supply and/or the diaphragm leaks fuel out the housing dripping it onto the outer carburetor pair.
Bill Silver
