Mon Feb 10 15:35:02 1997
- Message No. 380
From: Martin Franz
Subject: FUEL Pump
Hi,
I was curious about the fuel pump relay, so I had a look into the "elektro
map" (Schaltplan).
Very strange, maybe some can explain me some "secrets" (have currently no
access to may bike to check for my own, it's in a winter garage):
the fuel pump is connected to the "fuel switch" (Absperrventil). The fuel
switch is drawn as a "black box", so first question:
there is a "plus" and the "spark" cable from the CDI unit going in. I would
think, that there is transistor inside, which "switches" the plus to the
fuel pump. Right/Wrong ?
Second question: a fuel pump is "normaly" a membram pump, ie. not a
"motor", but a "elektro magnet and a anchor", so it works wether with
"pulsed current" or works like a elektro door bell (uff, is my english bad,
hope you know what i mean). Now it looks like, that the @ pump needs pulsed
current to work (at least, it gets pulsed current). Does anybody know ?
Third: it seems to me, that the fuel pump is cupled to the RPM, ie. more
RPM, more fuel. Is that realy right ?
Why I'm asking is simple: if the fuel pump needs pulsed current, a relay
solution is not to easy, need to cable the releay that it generates pulses
(is posible...). Otherwise, if the fuel pump only needs some(stable)
current to work, the solution would be extremly easy:
put a switch between the plus and the fuel pump input, press the switch for
some seconds before starting... all the required cables are just on the
fuel switch...
have a nice slide, martin
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