[TVI-RFI-EMI] Ford fuel pump Interference

[kd5ceu@juno.com]

Greg,

	You might want to check with the local stealership in your area. I
belive there is a Ford Technicial Bulletin on this very subject. Good
luck...



"The major difference between a thing that might go wrong and a thing
that cannot  
possibly go wrong is that when a thing that cannot possibly go wrong goes
wrong 
it usually turns out to be impossible to get at or repair." 

Danno
KD5CEU

On Tue, 25 Jun 2002 16:38:09 -0500 "Greg Taylor" <gtaylor@hsonline.net>
writes:
> Hello Group,
> 
> I just subscribed to this reflector and I am hoping to find an 
> answer to my
> problem.  I have a 1995 Ford Bronco. I have a couple of rigs in my 
> Bronco, a
> Kenwood TM-733 for VHF & a Kenwood TS-50 for HF with the AT-50 in 
> line back
> about 18 inches from a
> High Sierra 1500 Screwdriver antenna.  Also inline I have a Palstar 
> mobile
> Watt/SWR meter. My problem is that while the Bronco is running I 
> have as
> much as an S-7 noise level. Noise Blanker takes out most all the 
> other noise
> if any is there. I have done some tests and have found what I 
> believe is RF
> noise generated by the fuel pump. I have the power leads for the 
> rigs
> running directly to the battery with a 50 amp breaker out by the 
> battery
> plus the original fusing in the power lines of the rigs.  When I 
> turn the
> key to the ACC. position the S meter just sits on the left hand peg 
> or
> maybe a little reading. When I turn the ignition switch on and you 
> hear the
> fuel pump come on there is the noise at about S-7.  This is only 
> until the
> fuel pressure reaches the operating level and then the noise is 
> gone.  After
> the
> engine is running the noise is there all the time.  This makes it 
> difficult
> to hear signals lower than an S-7.  I can take the coax off the rig 
> and the
> noise is gone. I am quite confident this noise is RF being generated 
> by the
> fuel pump and the antenna or the coax is picking it up.  Well there 
> you have
> it. Has anyone seen this sort of problem before and does anyone have 
> a cure.
> I am open to suggestions and would like to try to get this problem 
> fixed if
> possible.
> 
> 73
> 
> N9OUK Greg
> 
> n9ouk@arrl.net
> http://my.hsonline.net/~gtaylor/index-2.htm
> 
> "The only thing necessary for the triumph of evil is for good men to 
> do
> nothing."
> Edmund Burke (1729-1797)
> 
> 
> 
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