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Fuel Pump for Bike Engine
RJK350 - 24/1/08 at 08:46 PM

Hi can anyone help.
I have just started building an MK Indy with an Aprilia Tuono V-twin engine. Do I have to fit an Aprilia fuel pump in the tank or could I fit an external pump. Engine has fuel injection throttle bodies. Thanks Rob

Richard Quinn - 24/1/08 at 09:21 PM

you can use an external pump but you end up in the situation where you really need a low pressure pump feeding a swirl pot which in turn feeds a high pressure pump. You will also need a return line. Or you can get a tank with a sump and bike (in tank) pump fitting and use an injected gixxer pump which doesn't need a return. I'd be interested in how you progress on all fronts as my current plans involve a V990 motor.

PAUL FISHER - 25/1/08 at 01:25 AM

Great choice in engine,they are a cracking motor,it will be a interesting build. In my opinion your always best running stock bike fuel pumps when ever possible,you know then its going to run at the correct pressure and flow rate,they have a built in filter,and sometimes a low fuel level indicator,you will have to run a fuel return pipe back to the tank,because the stock pump has no pressure regulator built in,its on the end of the fuel rail,unlike the gsxr and the zx10's etc,but thats no hassle if your in the early stage of your build,and if MK make your tank,give them your pump and they will make a small swirl pot on the base to suit,something like this,the mk tank,zx10r fitting

Richard Quinn - 25/1/08 at 10:13 AM

As far as I am aware, the gixxer pump has a regulator built in and if the pressure (41-43psi or something similar) is exceeded then it bleeds back to the tank internally and there is no need for a fuel return from the fuel rail (which would need blanking at the return end if it is not a gixxer fuel rail)

foes - 25/1/08 at 12:00 PM

quote:
Originally posted by Richard Quinn
As far as I am aware, the gixxer pump has a regulator built in and if the pressure (41-43psi or something similar) is exceeded then it bleeds back to the tank internally and there is no need for a fuel return from the fuel rail (which would need blanking at the return end if it is not a gixxer fuel rail)


Yeh i was told this by ian gray (stm), no idea if its true or not?
I'm using one and have ran a return to the tank, is this definitely not needed then..?

cheers

PAUL FISHER - 25/1/08 at 12:32 PM

Yes thats correct the injection gsxr 1000 pumps have a built in regulator so don't need a return,this is the same for my zx10r pump,but if your fitting one on a injection R1,then your fuel regulator will be on the end of your fuel rail,which has a pipe back to the tank,so this will need to be disabled,so thats why in my opinion its always best to use stock bike pumps when ever possible.

foes - 25/1/08 at 01:34 PM

quote:
Originally posted by PAUL FISHER
Yes thats correct the injection gsxr 1000 pumps have a built in regulator so don't need a return,this is the same for my zx10r pump,but if your fitting one on a injection R1,then your fuel regulator will be on the end of your fuel rail,which has a pipe back to the tank,so this will need to be disabled,so thats why in my opinion its always best to use stock bike pumps when ever possible.


Yeh just had a look, fpr is just underneath the fuel rail. I was going to just blank it off, but i have just for now put a return back to the tank because i thought it would be safer.

How would i disable the fpr then, just remove the vacuum line??

And if i do disable it does this mean i can remove my return to tank line?

cheers

RJK350 - 25/1/08 at 08:43 PM

Thanks for all your help on the fuel pump.
I think it's a stock Aprilia pump and I'll run a return fuel pipe.

Thanks Rob