[Mobile-Portable] 96 Ford Bronco fuel pump

[N5WV]

Gary & Group ,,,,  The 96 Bronco has a steel 30gal tank so it should insulate the pump "If it is noisy when its back on line. After the Bronco Im tackling a 05 Ford Excursion 6.0 diesel.  Your name sounds familiar ?  Did you work at Icom repair ?  Or maybe I know you from the Icom hf net ?    Thanks for the help.     Randy   N5WV 
----- Original Message ----- 
From: "Gary P. Fiber" <gfiber at comcast.net> 
To: "Mobile-Portable Reflector" <mobile-portable at mailman.qth.net> 
Sent: Monday, October 5, 2009 10:14:33 AM GMT -06:00 US/Canada Central 
Subject: Re: [Mobile-Portable] 96 Ford Bronco fuel pump 

Joe, 

Generally you would be correct with a metal fuel tank. But in my case 
1996 Ford Ranger XLT 2WD has a plastic fuel tank so it did nothing to 
shield electrical noise emitting from the fuel pump. I suspect the 1996 
Bronco fuel tank is also plastic. Ford did have a factory RFI filter 
they installed when they received complaints, they had to drop the tank 
to install it. When they did mine they did not locate up the gasket from 
the tank outlet lines and pump acess hole properly so on a fill-up I 
would get a strong smell of gasoline. 

Seems my 2009 Toyota Tacoma has a plastic tank too. I have not tried the 
706MKII to see if its fuel pump emits noise like the Ranger did. The 
noise from the Ford's fuel pump was over S9 made HF operation darned 
near impossible. I had the entire truck bonded, the antenna was on the 
left rear corner, power direct from the battery. Just turning on the key 
would raise a lot of noise in the transceiver. 

Gary Fiber K8IZ 


n1khb at aol.com wrote: 
> 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 
>   
>> ______________________________________________________________ 
>> Mobile-Portable mailing list Home: 
>> http://mailman.qth.net/mailman/listinfo/mobile-portable 
>> Help: http://mailman.qth.net/mmfaq.htm Post: 
>> mailto:Mobile-Portable at mailman.qth.net This list 
>> hosted by: http://www.qsl.net Please help 
>> support this email list: http://www.qsl.net/donate.html 
>>     
> 
> ______________________________________________________________ 
> Mobile-Portable mailing list 
> Home: http://mailman.qth.net/mailman/listinfo/mobile-portable 
> Help: http://mailman.qth.net/mmfaq.htm 
> Post: mailto:Mobile-Portable at mailman.qth.net 
> 
> This list hosted by: http://www.qsl.net 
> Please help support this email list: http://www.qsl.net/donate.html 
> 
> ______________________________________________________________ 
> Mobile-Portable mailing list 
> Home: http://mailman.qth.net/mailman/listinfo/mobile-portable 
> Help: http://mailman.qth.net/mmfaq.htm 
> Post: mailto:Mobile-Portable at mailman.qth.net 
> 
> This list hosted by: http://www.qsl.net 
> Please help support this email list: http://www.qsl.net/donate.html 

______________________________________________________________ 
Mobile-Portable mailing list 
Home: http://mailman.qth.net/mailman/listinfo/mobile-portable 
Help: http://mailman.qth.net/mmfaq.htm 
Post: mailto:Mobile-Portable at mailman.qth.net 

This list hosted by: http://www.qsl.net 
Please help support this email list: http://www.qsl.net/donate.html