I agree with kyle it looks like the same thing that is a part of the petcock assembly on the other models. Good luck finding a replacement diaphragm. You might be able to make one out of sheet rubber.
On 9/3/10, Kyle Munz <[email protected]> wrote: > Strange, that looks like the automatic one I have built into the petcock on > both my bike, only it's down by the carbs. There's a rubber diaphragm with a > spring in there. The spring closes the fuel valve, when the engine is > running the vacuum from the carbs opens the valve and allows fuel to flow. > If you have a hole in the diaphragm is could cause the problems you're > having. > > -Kyle > > > On Fri, Sep 3, 2010 at 11:30 AM, aldicara <[email protected]> wrote: > >> Hi Allen, >> Attached is a picture if the so called "Automatic Fuel Valve" --- I had >> refered to it as an "Automatic Fuel Pump" --- my error >> >> Parts manuals for the Honda Nighthawk CB750SC refer to it as such. Another >> name is the "Fuel Line Diaphragm". I've tried to order a new one but it's >> no >> longer stocked and not available. >> My problems started when I was leaking gas and found that it was coming >> from >> the vent hose (small one to the left on the picture). Took it apart, >> didn't >> really find anything wrong but I did use some gasket sealer . Now there is >> no longer any leakage, the engine starts but cuts out after about 30 sec >> --- >> to me it's starving for gas and I'm almost certain it's due to this valve >> which is defective but if anyone has other possible thoughts as to what >> else >> I would appreciate input. >> Thanks, Al >> ----- Original Message ----- From: "Allen Thomas" <[email protected]> >> To: <[email protected]> >> Sent: Friday, September 03, 2010 11:26 AM >> Subject: Re: [Nighthawk Lovers] Honda 750 nighthawk fuel pump >> >> >> Can you take a picture? What manual are you using? >> >> On 9/3/10, [email protected] <[email protected]> wrote: >> >>> Hi Kurt, >>> That's not what I referring to. It's on the other side of the valve and >>> is >>> where the gas from the tank feeds into, then on the the carbs. In the >>> parts >>> manual it's referred to as the "automatic fuel pump". >>> Thanks,Al >>> >>> >>> Sep 2, 2010 05:10:41 PM, [email protected] wrote: >>> >>>> >>>> >Okay, so... all joking aside. >>>> > >>>> >Al, are you referring to this little gem here, this darling right >>>> >under the tank? >>>> > >>>> >http://tinyurl.com/2aewrmb >>>> > >>>> >If so, that's not a fuel pump, it's a valve. The 750's carburetors >>>> >are >>>> >gravity fed. >>>> > >>>> >-Kurt >>>> > >>>> >-- >>>> >You received this message because you are subscribed to the Google >>>> >Groups >>>> > "Nighthawk >>>> >Motorcycle Lovers!" group. >>>> >To post to this group, send email to [email protected]. >>>> >To unsubscribe from this group, send email to >>>> >target="_blank">[email protected]<nighthawk_lovers%[email protected]> >>>> . >>>> >For more options, visit this group at >>>> >target="_blank">http://groups.google.com/group/nighthawk_lovers?hl=en. >>>> > >>>> > >>>> >>> >>> -- >>> You received this message because you are subscribed to the Google Groups >>> "Nighthawk Motorcycle Lovers!" group. >>> To post to this group, send email to [email protected]. >>> To unsubscribe from this group, send email to >>> [email protected]<nighthawk_lovers%[email protected]> >>> . >>> For more options, visit this group at >>> http://groups.google.com/group/nighthawk_lovers?hl=en. >>> >>> >> -- >> Sent from my mobile device >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Nighthawk Motorcycle Lovers!" group. >> To post to this group, send email to [email protected]. >> To unsubscribe from this group, send email to >> [email protected]<nighthawk_lovers%[email protected]> >> . >> For more options, visit this group at >> http://groups.google.com/group/nighthawk_lovers?hl=en. >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Nighthawk Motorcycle Lovers!" group. >> To post to this group, send email to [email protected]. >> To unsubscribe from this group, send email to >> [email protected]<nighthawk_lovers%[email protected]> >> . >> For more options, visit this group at >> http://groups.google.com/group/nighthawk_lovers?hl=en. >> >> > > -- > You received this message because you are subscribed to the Google Groups > "Nighthawk Motorcycle Lovers!" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/nighthawk_lovers?hl=en. > > -- Sent from my mobile device -- You received this message because you are subscribed to the Google Groups "Nighthawk Motorcycle Lovers!" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/nighthawk_lovers?hl=en.
