[Mobile-Portable] 96 Ford Bronco fuel pump

[N5WV]

Joe ,   Thanks for the tip. After the fuel tank is back on line I will hunt for any other noise problems.  Its been 10 almost 7 years sice I drove the Bronco , "Its been garaged" , went hf mobile once with Hustler's / 751A Icom and I dont remember much about any noise problems. Im going to be running a IC-7000 , Magnus Metron MLA-1000 and a Scorpion 680 series antenna.      Randy    N5WV 
----- Original Message ----- 
From: n1khb at aol.com 
To: mobile-portable at mailman.qth.net 
Sent: Monday, October 5, 2009 9:22:01 AM GMT -06:00 US/Canada Central 
Subject: Re: [Mobile-Portable] 96 Ford Bronco fuel pump 

Just some theoretical thoughts here - 
If the fuel pump motor is noisy, then the noise would be considered as 
coming from the supply wire leading to it. The pump itself is located 
within the tank which would act as a shield, therefore the only 
radiator left is the wire even though the pump is generating the noise 
in the first place. The best location for any filters for the pump 
would be at the tank in order to minimize the exposed length of 
unfiltered wire. This would hold true for an OEM filter or with a 
homebrew one. If I were to build a filter for this purpose, I would use 
a pi configuration. I wonder what the OEM one consists of. 
In my experience with Ford (actually a Grand Marquis) the engine 
computer was the proven major noise contributor, with the fuel pump 
contributing nearly nothing to the noise floor. Everyone (other hams) 
told me to suppress the fuel pump, but it just wasn't the case in my 
particular situation. I'm not saying that every vehicle works out the 
same way, just my experience. BTW, my Ford dealer bent over backwards 
to help me with my noise problems even to the extent of replacing the 
engine computer with a new less noisy version for FREE! Yay Ford! I'll 
remember that as a future potential customer. 

Best, 
Joe N1KHB 




-----Original Message----- 
From: Jerry Flanders <jeflanders at comcast.net> 
To: Mobile-Portable Reflector <mobile-portable at mailman.qth.net> 
Sent: Mon, Oct=2 
05, 2009 9:46 am 
Subject: Re: [Mobile-Portable] 96 Ford Bronco fuel pump 



Some auto companies provide a RFI suppression kit 
for the fuel pump, IIRC - ask. 

FYI - The fuel pumps that I have had always came 
on for several seconds to pressurize the fuel 
line as soon as I turned the key on. I didn't 
have to engage the starter or start the car - 
just turn the key. They made a slight vibration, 
and I could actually hear them running. Would 
have made it easy to see if they were causing 
electrical noise by themselves. Don't know if you 
can use this technique now with the tank out. 

Jerry W4UK 

At 02:19 AM 10/5/2009, you wrote: 
>Group , I have never operated hf mobile with my 
>96 Bronco and have no idea if its fuel pump is 
>noisy ? Â It is now at my mechanic with the 
>fuel tank dropped awaiting a new oem fuel pump. 
>With me picking up a new fuel pump this week and 
>with now being the time to add any noise 
>suppresion components to it , can anyone tell me 
>what I need to add besides toroids to the power 
>connections to the fuel pump. I have read in 
>past articles where some have added resistors , 
>capacitors , etc.  It may not be noisy but If 
>it is , now would be the time for remedy being 
>an internal fuel pump requiring the tank being 
>dropped.   Any tips would be great !   
> 73 ,  de  Ra 
ndy N5WV 
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