Sun Sep 14 05:47:29 1997 - Message No. 1446
From: Marcel_Sieling@d.maus.de (Marcel Sieling)

Subject: XRV650 fuel pump.


Hi,

a few days ago someone wrote something about a kit which changes the Carburetor
air outlet (Vergaserentlüftung). I think, this is the professional way to solve
this problem. However, here's my posting of this spring due to the time relais
solution:

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Hi,

so after a few days of beta-testing I can tell you folx: The fuel pump starter
relay works. [please calm down the applause]. ;-)

How was it done?

Often Africa Twin riders report problems while starting their bike after a
longer time of standing around (three days and more). Several attempts have to
be taken to start the engine.

This is due to a problem of the fuel supply of the carburetor. The outlet of
the tank is lower than the carburetor, so the @ has a electric fuel pump. This
fuel pump is controlled by a fuel cut relay, which normally operates the pump
when the engine is running. But the engine starts much easier, when the fuel
pump ran a few seconds *before* starting the engine.

So I bought the Delay on/off timer electronic kit (Verzögerungs-Ein-Aus-
Schalter Bausatz) of Conrad Electronic (for Phone Orders call 01805/312111 
24h Service from inside Germany), the Part Number is 19 59 01-99, it 
costs 20,95 DM plus expenses plus housing and mounting accessories.

The kit comes with a very detailed description, which helps any experienced 
electronician to easily and quickly build up the device. I soldered it all 
together, configured it for delay off for 5 seconds and wrapped the whole 
thing with duct tape tightly. I fixed three cables for connection to the @ 
fuel cut relay: Plus and minus Vcc go to the according pins on the Printed
Circuit Board, the third cable connects to one side of the Relay output, which
is closed when the relay is operating. The other side of the switch of the
relay has to be connected to plus 12 V. which is already available on the
board. So this third cable has 12V when the relay is operating.

Then I put it all in a small plastic box and glued the two halfs of the box
together with pattex hot glue (Heißkleber), so that it all becomes water
resistant. I fixed the box behind the left side plastic thing (linke
Seitenabdeckung) right behind the fuel cut relay and the CDI unit, about 1 cm
away from the lock, which unlocks the seat.

After that I connected the three cables: Ground to the green cable of the 
CDI unit, plus 12V to the red/black cable of the @'s fuel cut relay (which is
12V, if ignition of the bike is turned on) and the third cable (output of timer
delay relay) to the black/blue cable of the fuel cut relay.

Now if I switch on the ignition, the fuel pump runs for five seconds, so 
that I can start my @ with a full running fuel pump. After these five seconds
the fuel pump stops working, if the engine has not been started yet, so that I
can let the bike stand around with ignition switched on without having to take
care of my fuel pump. ;-)

After this modification the @ starts after three days in the rain, as if I
would have been ridden a few hours ago. ;-)))

The little box has a red LED light mounted, which I can see when I'm 
looking from the bottom side of the @ under the left side of it's seat. ;-) 
So it's easy to check, if that thing still does work, because of the 
vibrations of the bike it could be, that electronics fail after a certain 
time... Until now (about 1000 km, fastly increasing) it's still working. ;-)

take care - Marcello.


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