[RFI] 4 Runner Fuel Pump

Dennis Vernacchia n6ki@juno.com
Tue, 8 Oct 2002 22:29:35 -0700

Has anyone been successful in quieting down the noise from the
electric fuel pump in early 90s Toyota 4 Runners

I tried different mix beads including 43 and various ceramic caps to
ground from 
each lead close to the pump.....no effect

I know it is teh pump as with engine running I disconnect it and before
engine stalls noise level goes from S7 to S1

I also tried outiing a 250 uH choke in each lead and also caps to ground
on either side of choke and all I can do is INCREASE noise (hash) to S9
when caps are on far side of choke away from pump.

Values used were 0.002uf, 0.01uf and 0.05pF

We will try a same value caps directly across the pump leads as close
to pump as we can get which is 3 or 4 inches awauy from pump at connector
in wire harness  

Any other ideas appreciated....no, we are not going to drop the tank!

73, Dennis n6KI

Juno offers FREE or PREMIUM Internet access for less!
Join Juno today!  For your FREE software, visit: