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Message |
    
Guardian
Junior Member
Username: Guardian
Post Number: 40
Registered: 5-2004
| | Posted on Monday, June 11, 2007 - 10:41 am: | 
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Ok ? when i put my 29ltd st in my full bronco i get noise from the electric fuel pump i moved my ground but it did not change any thing what can i do to fix this problem.Doug |
Penrider
Intermediate Member
Username: Penrider
Post Number: 155
Registered: 1-2007
| | Posted on Tuesday, June 12, 2007 - 1:14 am: |
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that's a standard ford fuel pump problem...some people get lucky and have a recall on theirs (depends on make/model/year, etc) and get newer ones...if not, make sure your power hot is straight to the battery...ground to the battery is usually ok, but in this case ground to the seat mount bolt, and ground from the radio case screw itself to the seat mount bolt...if noise persists, add a power line noise filter on the hot wire...if it still persists, put a couple of ferrite chokes at the power input of the fuel pump itself and at your radio...if all these don't do it, leave these done and change one thing...Use RG-213 or heavier COAX(100% shielded is best) as your power cord(just don't use it for anything bigger than a normal cb)...center strand for hot and shield for ground...leave the hot at the battery and the ground at the seat mount bolt...I've seen this work a few times(if coax will shield rf it will shield dc also, same thing)...also, check all coax connections and your antenna ground(might be feeding through the antenna instead of or along with the power cord)
always made me wonder about that problem though...if ford's fuel pumps are that leaky/noisy, how do they filter it out of the factory stereos??
Sean
CEF867
CVC81
Ham252
(pic is of me and LilBritches-cef899)
"Keep smiling, it makes people wonder what you're up to!!"
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Tech808
Moderator
Username: Tech808
Post Number: 13879
Registered: 8-2002
| | Posted on Tuesday, June 12, 2007 - 7:10 am: |
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Guardian,
Check with your local Ford Dealer Service Dept and see if there has been a Service Bulletin on your make & model to solve the problem.
You may also want to try the MAGNUM FILTER POWER CORD.
CLICK HERE > MAGNUM Power Cord w/Filter
We use them in our Explorer, F-150 Super Crew, and Focus.
Lon ~ Tech808 ~ N9CEF
CEF#808 ~ CEF HAM#33 ~ CVC#002
Tech808@copperelectronics.com
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Tech237
Moderator
Username: Tech237
Post Number: 811
Registered: 4-2004
| | Posted on Wednesday, June 13, 2007 - 1:48 pm: |
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Ifd you use coax to ruyn the power only connect the shield at one end and run two lengths one for positive and one for negative.
Simon
Tech237
KD7IEB
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2ir473
Intermediate Member
Username: 2ir473
Post Number: 116
Registered: 7-2002
| | Posted on Thursday, June 14, 2007 - 9:03 am: |
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Ford fuel pumps are known for being noisy and generating a lot of RF hash.
There are some excellent articles on the web about reducing noise from fuel pumps. Most articles state that cutting the power leads near the pump, and then winding the leads around some ferrite cores, and splicing them back together, yields the best results. Also, combine that with bonding your vehicle with a bonding (grounding) braid, reduces interference.
I have a '92 Ford Ranger, and had lots of interference from the fuel pump.
Here is what I did to reduce the noise significantly...
I placed snap-on ferrite cores around the power leads to the fuel pump (the leads were run not accessible at the pump without dropping the tank, so I placed snap-on cores where I could access the wire leads),
I used 1/2 tinned braided ground strapping to bond the truck body together. Straps were placed from the frame to the truck cab, frame to the truck bed, frame to the exhaust, and truck cab to the engine block. This was done in several locations throughout the length of the vehicle.
Also, the antenna mount must be grounded in this same fashion.
An in-line DC power filter was used to help reduce electrical noise, such as ignition noise.
As I run an mobile amplifier for 10 meter use, I found in line power filters that are rated for 35 amp draws, from places that sell car audio components.
This reduced the noise levels significantly, and made an otherwise unusable vehicle, very enjoyable for mobile operating. I used the same approach on my '96 Chevy Impala SS, which has a lot of performance upgrades and can throw a lot of RF interference, and it quieted that right down too.
Paul
2IR473
CEF-218/ham #107
CDX8412
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Hotwire
Senior Member
Username: Hotwire
Post Number: 2279
Registered: 1-2005
| | Posted on Tuesday, June 26, 2007 - 11:16 am: |
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Most likely the noise is coming in through the antenna.
Be sure you have good coax for starters. Play around with different routes installing the coax, sometimes that helps. Make sure the antenna mount is well grounded to the vehicle. Try to get all of the antenna above the roof. It's not easy getting rid of the terrible Ford fuel pump noise. I always know when a Ford drives by my Chevy!
Good luck
Kenny
cef491(27.115lsb)
2sf491(27.555usb)
Indiana
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