I just replaced my stock vacuum fuel pump with a
electric unit from a 1999-2002 Yamaha YZF-R6. I
bought the pump off ebay for $20.
Here are a series of pics of the install:
The install went very easy. I had to make a bracket
to mount the pump to one of the existing vacuum fuel
pump mounting holes. If you look at the pics, you can
see the bracket is nothing more than a 2.75" long
piece of 1.5" steel angle, with a couple of mounting
holes and two relief cuts to clear the frame.
The pump is rubber isolated, via the factory mount (it
clamps around the fuel pump body). Very quiet and
vibration free install.
Since the fuel pump draws so little current (only .7
amps - measured), I decided not to use a relay as
others have done, and wire it directly into the 10A
fused ignition circuit, (this is how the YZF-R6 is
wired as well).
Next to the battery are two existing relays, the
larger one next to the left frame rail is the safety
interlock relay. A input into this relay is the
ignition circuit, after it has gone thru the kill
switch. This circuit is a 'red/black' wire. I tied
the fuel pump positive line (black/blue) into this
wire. Power is applied to the pump only when the
ignition switch is on and the kill switch is in the
'run' position. I ran the fuel pump negative wire
(black) directly to the negative terminal of the
On the R6 pump, the inlet pipe is 3/8" in diameter,
and the outlet is 5/16". The existing fuel line is
5/16". Luckily my pump came with the inlet fuel hose,
which is 5/16", but had been factory formed to fit
over the 3/8" inlet. I cut this line to the
appropriate length and used a 5/16" brass nipple to
connect it to the existing fuel supply line. (Sorry for the imperial measurements - we have not been metricsized over here)
For the outlet, I used a metal fuel filter (from a
1980 Ford Bronco with a 302/350 V-8 motor) . This was the
smallest fuel filter I could find that had 5/16"
inlet/outlets. This connected directly to the
existing line to the carb. Any filter that is suitabily sized will work just fine, as the pump only puts out around 2psi.
Using this setup no bike mods were required. And
everything can be changed back without issues.
The bike does seem to be more responsive since putting
on this pump. I have read that at higher RPM the
stock fuel pump cannot supply enough fuel and on a
dyno they have observed a 5+hp loss due to this. As a
side benefit, you don't have to worry about priming
the vacuum pump when you run out of fuel!
A YRF-R1 is a bit easier to mount, as you don't have
to make a bracket, and both fuel lines are 5/16".
Hope this helps.