Fuel Pump Resistor
Discussion
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.
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.
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 
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
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
Interesting Simon, spikes/noise you say 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
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 said:
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
For 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 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
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
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
Spot on Simon, thanks. 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
Sardonicus said:
ertainly not.
Where do you live ? I`m coming over with the car to do some dyagnostic wiring checks .Thing is if there is a voltage offset everything else must be out such as trigger wheel settings etc etc etc .
Just bought one of those condensers ,does it just replace the wire from the negative on the pump to the ground (chassis) or do I have two leave the ground in and run both .
Edited by SILICONEKID343HP on Sunday 21st July 19:37
It will be there to suppress electrical noise generated by the commutator and brushes as it rotates more than any back emf generated as the pump switches on and off. If you want to suppress arcing across relay contact as you switch heavy inductive loads, you would put the cap' across the relays contacts where the arc occurs. If you dont have it fitted to the pump its more likely to produce noise on any audio equipment.
blitzracing said:
It will be there to suppress electrical noise generated by the commutator and brushes as it rotates more than any back emf generated as the pump switches on and off. If you want to suppress arcing across relay contact as you switch heavy inductive loads, you would put the cap' across the relays contacts where the arc occurs. If you dont have it fitted to the pump its more likely to produce noise on any audio equipment.
Good point Mark I overlooked it don't go across the + - terminals hence it will have no influence on relay contact life 
Daz your WB offset will have no influence on your sensor inputs all things being equal (not seen your install) certainly not trigger wheel tooth offsets Edited by Sardonicus on Sunday 21st July 20:31
Sardonicus said:
ood point Mark I overlooked it don't go across the + - terminals hence it will have no influence on relay contact life Daz your WB offset will have no influence on your sensor inputs all things being equal (not seen your install) certainly not trigger wheel tooth offsets
purchased the condenser thing ,how do i fit it . I overlooked it don't go across the + - terminals hence it will have no influence on relay contact life Daz your WB offset will have no influence on your sensor inputs all things being equal (not seen your install) certainly not trigger wheel tooth offsets Edited by Sardonicus on Sunday 21st July 20:31
Sardonicus said:
ecause if you go FP - to chassis ground its the same thing Daz 
you wont be suppressing/cleaning FA
Well when I took the old one off the black metal block thing was bolted to the chassis , the thin black ground wire went to the negative side of the pump . you wont be suppressing/cleaning FA The live came from the relay to the positive side of the pump .
I`m confused .. Just thought I would be removing the ground cable from the pump for the condenser,then bolt the condenser part to the chassis
Edited by SILICONEKID343HP on Monday 22 July 10:29
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