Ducati Sporting Club UK > Model Specific - Discussion, Technical Problems and Help > 998 / 996 / 916 / 748 > 916 / 748 Tank Fuel pump

[knappers]

Thanks for info was aware of pressure difference.
It was used with this set up for quite a long time some years ago, when I bought it with other bits it had been left standing rotting a long time. The owner then didn't know anything about it.
What happens to the carbs when the float bowls are full? will the pressure overwhelm them?? Or does excess fuel return to tank? Was wondering if I could just use feed from tank to carbs and block off return.
I had heard DD boys had done this conversion but can't find anything much about it on forum.
Thanks

[skidlids]

I have two DD bikes running the 916 tank and pump but as they are Class A fuel injected bikes they are designed to run 3 bar fuel pressure.
I have known a Carb'd bike with a return to run on 3-bar for a short while, but it wasn't tried long term so not sure how reliable it would be as any problems with the float shut off needles will soon have the engine full of fuel and there will be a greater chance of this if you didn't have a return.
If running a 916 style pump on a carb'd engine I would run a return and also look at changing the fuel pressure regulator in the pump housing to a lower spec one, not sure how low the regulators go possibly 2.5 bar, 2.2 bar and 1.8 bar

[knappers]

Thanks skidlids. Need to change pressure regulator as you say.
It's definitely been run carb'd with this 3 bar regulator before but I don't know the history of it.
What if fuel pump Is left disconnected, would that be enough to feed the carbs until fuel was too low in tank?
Just another quick question for you, because of space restrictions under rear seat unit where battery now resides. A YTZ14S is the biggest I can get in there. Bit down on AH but CCA are high (haven't got it yet just going on spec and dimensions). I ask because I believe you DD boys use smaller battery's. Better say this has a 95 engine in it think they require more oomph than the newer ones to start. Is that somthing to do with the gearing.
Thanks.

[knappers]

Nearly there, need to sort out rest of electrics, get some clip ons. Straighten some bent bits, sort cosmetics. Looking for a light weight back wheel to match the front.