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Author Topic: 1994 Dakota Fuel pump RFI  (Read 482 times)
KC2FXE
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Posts: 1




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« on: April 25, 2003, 08:49:35 PM »

 Hello all I have 1994 dakota that i have IC706 and a homebuilt screwdriver ant.
 i have s9 noise with the engine running that's a steady hash type noise but when the key is turn off the noise is gone,
 I've grounded the exhaust pipe ,muffle,rear box all to the frame.
So any idea's would be apprecate it .
                             John KC2FXE
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K0BG
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« Reply #1 on: April 26, 2003, 09:10:52 AM »

Does the noise vary with engine speed or does it lag behind? I sort of doubt this is fuelpump; I suspect it is ignition noise.

If it is the fuel pump, snap on beads are a good solution. Use mix 43 available from several different sources. They should be placed as close to the pump as possible. And, it may take several beads.

If it is ignition noise, first replace the plug wires with new factory loom. Don't use aftermarket unless you are sure they duplicate factory or you'll end up with more noise not less! While you're at it, replace the plugs and make sure they're gapped correctly. Surplus sales of Nebraska sells snap on beads with a 3/8" ID which will snap over most plug wires. They should be as close to the distributor or coil pack as possible. If your Dakota has a distributor, you need to bead the coil lead too.

I have several articles posted here on eham.net which you might want to read.

4407, 4424, 4425, and 4623.

Alan, KØBG
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N7PTM
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« Reply #2 on: May 01, 2003, 02:09:22 AM »

Alan's ideas are good; but first I'd check with the dealer and see if there are any TSB's out there for fuel pump electrical noise. You may have to pay for the fix if the truck is out of warranty.
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