Mon Sep 15 22:27:59 1997 - Message No. 1449
From: "Dirk De bruyn"

Subject: Re: XRV650 fuel pump.


Marcel,

The subject of this mail says XRV650 fuel pump.
Now, I have bought a XRV750 only one month ago.  Yesterday I experienced
trouble to start the bike.  It was the first time this happened and I was a
bit worried.  But I hadn't driven the bike for 6 days, so is this a problem
that all @ have?

Greetings,
Dirk
----------
> From: Marcel Sieling 
> To: 
> Subject: XRV650 fuel pump. (XRV-LIST)
> Date: zaterdag 13 september 1997 3:55
> 
> 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:
> 
> -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
> 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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dipper@normans.isd.uni-stuttgart.de