740 fuel pump relay

  • Thread starter Thread starter holbay
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holbay

hi all can anyone tell me where the fuel pump relay is on a 1988 740 estate
with B200E engine mine appears to be shot and i dont know where it is.
thanks
 
holbay said:
hi all can anyone tell me where the fuel pump relay is on a 1988 740 estate
with B200E engine mine appears to be shot and i dont know where it is.
thanks
Click to expand...
It should be behind the aschtray (maybe spelled wrong) behind the fuses
if you pull out the fuseholder there is some relays plased behind them
and the relay you are looking for is in place E
 
thanks Jan found it and had to re-solder the relay back on but now engine
starts and die`s now think one of the fuel pumps faulty. thanks for your
help,holbay
 
holbay said:
thanks Jan found it and had to re-solder the relay back on but now engine
starts and die`s now think one of the fuel pumps faulty. thanks for your
help,holbay
Click to expand...


Does the tach droplike a rock when the engine dies or does it follow the
RPM?
 
hi james rev counter follows engine just like running out of fuel. when it
stops the pump which runs till pressure is reached is not making usual
sound, it growls so suspect it knackered. thanks.
 
hi james rev counter follows engine just like running out of fuel. when it
stops the pump which runs till pressure is reached is not making usual
sound, it growls so suspect it knackered. thanks.
Click to expand...


Fuel pump relay can also fail by through contact erosion since it is
switching large current. I bonded some fine grit abrasive paper back to back
and cut a sliver that can slip between the contacts for cleaning. the middle
of two relays on the circuit board seems to suffer most of the wear.



Regards,

Boris Mohar

Got Knock? - see:
Viatrack Printed Circuit Designs (among other things) http://www.viatrack.ca

void _-void-_ in the obvious place
 
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