[Mobile-Portable] 96 Ford Bronco fuel pump
N1KHB at aol.com
N1KHB at aol.com
Wed Oct 7 09:54:32 EDT 2009
Wow. I had no idea that any plastic fuel tanks for oem use existed. I only
knew of them for aftermarket/auxiliary use. And your test as described
would certainly seem to prove the fuel pump as a culprit.
As appealing as it is for any number of reasons, HF mobile can
certainly be a challenge. The best that some hams may be able to do is to resign
themselves to the fact that the motor vehicle is a transporter of the HF
equipment rather than a practical platform for operating while underway.
Best,
Joe N1KHB
In a message dated 10/5/2009 11:12:23 A.M. Eastern Daylight Time,
gfiber at comcast.net writes:
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 !  Â
>>  73 ,  de  Ra
>>
> ndy N5WV
>
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