resistors in wires to in tank fuel pump?

  • Thread starter Thread starter Charles Marshall
  • Start date Start date
C

Charles Marshall

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
http://www.geocities.com/[email protected]/P5190992.jpg
 
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
Click to expand...

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

David.
 
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
 
You're right, it's a choke. I soldered the wire to the pump terminal and
put it back together, but still no go. Gonna have to replace the pump I
reckon.
 
You're right about it being a noise filter. I put soldered the wire to the
pump and put it back together and still no go so apparantly the pump has
gone out.
 
Charles said:
You're right, it's a choke. I soldered the wire to the pump terminal and
put it back together, but still no go. Gonna have to replace the pump I
reckon.
Click to expand...

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.)

--
Mike F.
Thornhill (near Toronto), Ont.

NOTE: new address!!
Replace tt with t (twice!) and remove parentheses to email me directly.
(But I check the newsgroup more often than this email address.)
 
Thanks for the help guys, I replaced the pump and I'm back on the road.

Later
 
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