Fuel Pump Resistor

[ChimpOnGas]

Hi, can someone conclusively tell me the purpose of the tiny little thumbnail sized black box that hangs on a pigtail wire at the Chimaera fuel pump?

The pigtail wire simply goes to ground at the fuel pump mounting stud on the chassis.

Is it a resistor for the fuel pump?

Or some sort of suppressor/ferrite to try to limit the fuel pump generating radio interference?

Thanks in advance, Dave.

[ChimpOnGas]

Thought so, just double checking.

Well it doesn't do a very good job does it

I have an idea

[ChimpOnGas]

Sardonicus said:

If you ask me it saves the contact life in the FP relay and suppresses voltage spikes/noise things like ECU's that take low voltage signals don't like noise the FP draws a sizeable chunk of juice starting up the radio suppression is just another bonus although not necessary if it was for radio suppression purposes only then the alternator heater motor & wiper motor would follow suit

Edited by Sardonicus on Saturday 20th July 21:42

Interesting Simon, spikes/noise you say

So lets just say it wasn't connected

What symptoms might you expect; say if you had a Canems Dual Fuel ECU for example

Spikes/noise you say, very interesting

[ChimpOnGas]

Sardonicus said:

or what its worth I would just fit a conventional points dizzy style condenser/cap back to the fuel pump + and Ground - chances are Dave it will make no difference but it wont do any harm either I use something like this because mine fell to pieces some time back too http://www.onlineautomotivesolutions.co.uk/82-93-n... the exact value is not important in this case IMO

Edited by Sardonicus on Saturday 20th July 22:22

Spot on Simon, thanks.