RWD - Fuel Pump wire connections
                    

Volvo RWD 140-160 Forum

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Fuel Pump wire connections 140-160

73 164 wire connections to fuel pump, which one is positive? The wires are not different colors and there are no marks on fuel pump, trying to rework a prior set up with am pump to Bosch. Thanks in advance
John




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Fuel Pump wire connections 140-160

Never mind-got that handled but now when car is running the wires to the fuel pum are very warm--is this normal?




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Fuel Pump wiring warm... 140-160

...with everthing operating normally, (that is, no extra abnormal currents added in...this is possible with a motor if it working harder than normal for some reason, the extra load requires motor to draw more current to maintain constant speed) warm wires indicate too small a gauge wire for the currents passing through them...

I suggest you measure the current and determine if it is normal or raised, then proceed accordingly...short of making an engineering investigation out of it, you may just want to increase wire gauge...

Additional:

...warm terminals indicate a poor connection (either due to corrosion, or a bad crimp...which can be as simple as not getting all strands into the crimped area...effectively decreasing the cross-sectional area for current conduction, or some combination of the two.

Use Anti-Corrosive-Zinc-Paste on terminals, especially those under the vehicle and subject to even more environmental nastiness, NOT "dielectric paste"...why anyone would want to put a total INSULATOR on electrical connections is beyond me!!! ...maybe because the word dielectric has the word "lectric" in it, so it must be good for 'em...WRONG!

See: http://sw-em.com/anti_corrosive_paste.htm

Cheers




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Fuel Pump wiring warm... 140-160

Thanks!! The wires to the pump are broken somewhere before the pump, as when I move the harness it well stop or start working again. Going to replace those with heavier wire. Went to get some Anti Corrosive Paste at the parts store but of course it seems no one has it. Where do you get it? Thanks for your help!
John




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Fuel Pump wiring warm... 140-160

John;

An intermittent condition can be due to fatigued wires where the strands are barely touching anymore, and that based on position or vibration...there is also plenty of heat produced by the arcing and sparking (plasma!) which occurs as the connection comes and goes, so you may be able to follow the heatsource to the open/interm. problem location. You're probably pretty close to the source of problems...

ACZP is not generally considered an automotive item, even for a well stocked automotive parks house (sure, IPD started carrying it in tiny tubes the size of lip protector balm, but at the rate I use it, and send it out with kits, I need to buy it in slightly larger quantities!)...and what does the automotive chain store specializing in neon-license-plate-frame or blue-LEDs-on-the-windshield-washer-nozzles, know or care about vintage cars and restoration/corrosion protection of their electrical connections?

Buy ACZP at commercial electical supply houses...as you likely read, I highly recommend and prefer Burndy's Penetrox product over the Ideal's low viscosity product (which doesn't stay put!) available at the common chain home improvement/hardware superstores...I have even seen Penetrox offered on the familiar on-line auction site, so you can let your fingers do the walking/ordering, and UPS will bring it to your door...can't beat that!

Cheers




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Fuel Pump wiring warm... 140-160

In that case.. yes. Absolutely replace those wires. I would do so before you leave the driveway... a car prone to dying unexpectedly is rather a bit of a safety issue.

--
-Matt I ♥ my ♂




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Fuel Pump wire connections 140-160

I don't know if it's normal, but.. I don't like it. you mentioned someone had an aftermarket pump in there.. maybe they did some aftermarket wiring using wire too small... check and make sure any connections and/or splices are clean and properly done.

--
-Matt I ♥ my ♂




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