The fuel pump wiring on the bike engine is quite short. But in a BEC you have to place the fuel pump at the back of the car at the bottom of the tank
while the engine is about 2.5m away in front. Has anyone ever had problems with the wiring of the fuel pump from the tank to the engine? I mean that
the extra wire needed to connect the pump plug to the engine wiring loom should add some resistance to the circuit, right? Does this affect the engine
operation in any way and what have you done to minimise the effects ?
Any tips or suggestions you might want to share?
The voltage drop is trivially small, owing to the use of a fuel pressure regulator the problem would only show itself if you are near the flow limit
of the pump. If you are concerned then increase the diameter of the cable.
Here are some numbers if you want to do the calculations.
The current draw from a carbed pump is about 1A (on average, they pulse a lot), from an EFI pump it is about 3A.
and a calculator
http://www.sengpielaudio.com/calculator-cross-section.htm
Thanks for the link Matt!
OK, it should only be minimal regarding the pump current. But i think it will affect the fuel level signal a bit more, since the voltage of that
circuit is low?
My fuel sender is always reading low and its probably due to this. How can I keep the voltage constant through such along run? Thicker cable ?
[Edited on 15/1/12 by Toprivetguns]
More lightly to be a sender issue, nearly all cars have the tank at least as far away from the dash as a locost.
Easy fix, pull the sender and bend the arm to compensate.
quote:
Originally posted by mark chandler
More lightly to be a sender issue, nearly all cars have the tank at least as far away from the dash as a locost.
Easy fix, pull the sender and bend the arm to compensate.