resistors in wires to in tank fuel pump?

Question

1990 740GL with the Regina single pump fuel injection system. Developed intermitent problems with the fuel pump not running and when I pulled the pump found that the positive wire had gotten hot enough to burn through the shrink wrap that is installed over the resistor which is soldered to the pump. I've never seen a setup like this before and wondered if anyone else had seen this. I'm thinking maybe some shade-tree wannabe put these resistors on here thinking it would improve the mileage (no happening). I'm including a link to a picture of it on geocities (apologies for the ads, can't pay for the premium page there). If you've seen this before or if you know if these resistors are supposed to be there, please respond. Thanks

formatting link

snipped-for-privacy@sbcglobal.net/P5190992.jpg

David Taylor · Accepted Answer

Have you measured that with a meter?  I was just wondering if it's a choke and not a resistor?David.

AsbjÃÂ¸rn · Answer

I do not know this system, but that looks more like electronic noise suppressor coil to me. That is thick copper wire wound on a ferrite core, and has no significant DC resistance. The overheating may be due to a short cirquit (to the "ground") in the pump, or even more likely to a damaged wire at the connection.

Asbjørn

Charles Marshall · Answer

You're right, it's a choke.  I soldered the wire to the pump terminal andput it back together, but still no go.  Gonna have to replace the pump Ireckon.

Charles Marshall · Answer

You're right about it being a noise filter. I put soldered the wire to thepump and put it back together and still no go so apparantly the pump hasgone out.

Mike F · Answer

Well, since you've got the pump in your hand, what happens if you apply

12V directly to it? Those chokes are only to keep electrical noise (for the radio) to a minimum. (Running the pump dry will kill it, but it won't hurt for a couple of seconds.)

Charles Marshall · Answer

Thanks for the help guys, I replaced the pump and I'm back on the road.Later

resistors in wires to in tank fuel pump?

Join the Discussion

Didn't find your answer?