[Shotimes] RE: semi OT: how do senders work?

[Justin Schick]

I don't think mine is that sophisticated. I was thinking even simpler,
the carb (850 Demon) would have enough gas in the bowls to get it
started, and you have some oil pressure (enough to affect the sender I
don't know) from just cranking the motor. The regulator is a dead head
style (no return) but I don't know if that would help a cold start
situation or not. The biggest advantage of wiring it this way is
supposed to be to cut the fuel pump off if the engine stalls, before you
realize to turn the key back to make it stop pumping.

So I guess this works, or no? I understand how the adjuster works
inside the sender but not how it affects the voltage I assumed was in
that wire going to the sender.

If I can't run the wire from the sending unit, I was going to run it to
the fender-mounted starter solenoid up by the battery. I'd just put it
on the small "I" post of the solenoid, not the "S" one right?

Thanks everyone for the replies.

Justin

>>> Kenneth Epperly <epperly1@optonline.net> 5/10/2004 5:15:32 PM >>>
There is a timing circuit to allow it to run for 3 seconds to build
pressure, then if the motor fires the pump circuit is completed through
the
oil pressure.

        Ken
----- Original Message ----- 
From: "Paul L Fisher" <sho@paul-fisher.com>
To: <TechSHO@topica.com>; <shotimes@autox.team.net>
Sent: Monday, May 10, 2004 5:23 PM
Subject: [Shotimes] RE: semi OT: how do senders work?


> If the fuel pump only runs when there is oil pressure how would you
start
> the motor?
>
> The sender basically is a variable resister. Depending whether the
sender
is
> a pressure or temperature sender, the increase in
temperature/pressure
> causes the resistance to go up/down (depending on design). Basically,
the
> wire from the sending unit is ground.