Fuel pump noise elimination

[Moleculo]

I thought I'd post this here in case people don't always get over to the Tech Bench section.

A couple of weeks ago I replaced the fuel pump in my Jeep. While I was at it, I decided to work on the fuel pump noise that is VERY annoying on this vehicle. It's so bad that it's a good 2-3 S Units worth of noise at all times. The fix I did was very simple and it eliminated ALL the fuel pump noise from both radios in the Jeep. It's not that hard and it's definately worth the time to do.

I got a big ferrite toroid...the biggest one I had is one that I cut off an old CRT monitor cord. It still wasn't as big as I really needed, but it was a good start. I cut the power lines to the pump fairly close. Took extra wire, wrapping both the pos. and neg. wires through the torroid as many times as I could. For the lower bands, you probably need 10 or so turns, but I could only get about 4 or so through this toroid because the wire guage needed wasn't very small. Since I could only get that few, I used a few snap on beads, as well. On either side of the main choke, I soldered in a .01uF ceramic cap from pos. to neg. Attach the whole thing inline with the pump power line, and presto!! Noise gone.

I hope that helps someone....

 

[lords]

RS has a Snap-Together Toroid Choke Core-2-Pack
that works the same I had to do it with the ford van...

 

[Captain Kilowatt]

I did the same thing but without the torroid. I just used the cap across the power leads and presto it was all gone.I would suggest that method first and then add the torroid if there is any noise left which is unlikely. I had to do the exact same thing to two differant vehicles I owned and yes they were both Fords.

 

[lords]

cool good to know....what size?

 

[Captain Kilowatt]

I just used a 0.01 uF cap rated for 50 volts,one of the cheapo ceramic types.Make sure you get the wires correct.there are usually three wires,pos,neg and tyhe one from the sending unit. Just use the pos and neg.

 

[lords]

thanks..

 

[lords]

or Flying Over Rough Dirt ..
this van is a custom work van and well worth its weight for what it does..thats all that counts to me...all I ut into it is breaks and tires...the name I don't care about...But i do know the sayings..
theres also one for chevy and pontiac...

 

[thetnhillbilly]

Here is a link to a pretty long list of car acronyms:

www.donsautopages.co.nz/autoacronyms.htm

 

[Moleculo]

Actually I had tried the just the cap a long time ago by itself and it didn't help in my vehicle. In fact it was still there when I started all this. I even tried to add a few snap together toroids, but that didn't do it either. Every vehicle is different, so you have to see what works in your situation.

 

[Captain Kilowatt]

Actually I had tried the just the cap a long time ago by itself and it didn't help in my vehicle. In fact it was still there when I started all this. I even tried to add a few snap together toroids, but that didn't do it either. Every vehicle is different, so you have to see what works in your situation.

I guess my bad old Ford is not so bad after all.

 

[lords]

Here's what bob uses.

Is the pepsi can there to help give it color

funny thing is in my TS 667V I watch one smoke all the time...
so me still looking into this problem