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88delta88
Joined: 09 Jun 2003
Posts: 2400
Location: Canada
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| Posted: Mon Mar 22, 2004 11:22 am Post subject: Fuel pump wiring upgrade? |
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good day everyone!
I was sitting at a light the other day, with my signal flashing, and I noticed the hum of the fuel pump dims to the flasher... I've heard in the past that manufacturers commonly under-wire thier fuel pumps for how much electricity they require.
I am wondering if it would be worth upgrading the wiring to the pump, and put a relay to switch it on and off using the factory wire. It just sounds to me like it might last longer, and work better if it were'nt starved for power all the time. |
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OldsGuy
Joined: 16 Feb 2004
Posts: 269
Location: Lees Summit MO
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| Posted: Mon Mar 22, 2004 3:06 pm Post subject: |
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| It shouldn't do that and I wouldn't do what you suggest. Check your alternator/battery/charging circuit. I bet that is the trouble. |
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88delta88
Joined: 09 Jun 2003
Posts: 2400
Location: Canada
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| Posted: Mon Mar 22, 2004 5:25 pm Post subject: |
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no... battery and charging curcuits work great! But I definately hear the pump slowing down when there is load... None of my other power systems seem to be affected by this, and I am almost certain that the problem has been occurring ever since I bought the car.
Maybe I should find the power wire of the fuel pump, and measure voltages before I jump to conclusions though...
I'll measure right at the pump, and then flick the signal on (thats what causes it the worst) and see what the meter reads. |
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OldsGuy
Joined: 16 Feb 2004
Posts: 269
Location: Lees Summit MO
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| Posted: Tue Mar 23, 2004 8:58 am Post subject: |
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| Well, it is possible that somehow the pump is not getting the full 12 volts required to drive it at the correct speed OTHER than the battery being low to begin with but I think that would be very rare. That would require an introduction of extra resistance in the pump circuit, degraded wire condition might cause that but more than likely it would only result in a short to ground which would blow the fuse that circuit is on. A more likely cause would be the pump itself is not working as it should if you are absolutely sure your battery is charging. You should have 13.8 volts on your battery terminals as well as at the pump. If the voltage drops to less than say....11 volts I would think you would begin to see what you are describing. I think you should double check your charging circuit/battery. Does your car have full instrumentation? If so, does it have an amp meter or a volt meter? If an amp meter, you should see that needle deflect in a direct relationship to the pump motor slowing, a volt meter would also drop in voltage in a direct relationship to the pump motor slowing. Try this test too, use your headlights on high beam, then turn the direcrtional signal on, this will put EVEN MORE of a load on your charge system and exacerbate the situation even more. If this doesn't occur then it may be the pump itself, perhaps this is a normal condition in all those model cars and you just have extremely sensitive hearing, can other people detect that as well? Good luck in finding the solution. |
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88delta88
Joined: 09 Jun 2003
Posts: 2400
Location: Canada
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| Posted: Tue Mar 23, 2004 10:35 am Post subject: |
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well, I know the charging circuit works well, so I will do the load test as you suggested. I think it may be quite possible that the connector somewhere down the line may have corroded. I dont have full instrumentation, but I do have an ALDL computer that I can consult, along with my trusty volt meter.
Sensitive hearing? :-) Never had someone suggest that about me :-) Selective maybe...
Anyways, I shall try and find the problem (if any)... Maybe my fuel pump is going down the tubes too, as you suggested.
Anyways, thanks for the help, I'll keep you posted. |
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strokercutlass
Joined: 09 Jun 2003
Posts: 379
Location: Wis
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| Posted: Tue Mar 23, 2004 11:20 pm Post subject: |
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| 88..a couple things that came to mind....in most cases, unless the fuel pump has been replaced and the dampener sleeve wasn't installed on the new pump before it was put into the tank, you really SHOULDN'T hear the fuel pump running while in the car, especially while running..in most cases a noisy pump equals either a fuel pump starting to wear and go bad, or possibly a fuel filter which is getting plugged, therefore making the pump work harder and be noisier...also, the fuel pump is triggered via a fuel pump relay already, so installing one would be somewhat pointless really... |
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OldsGuy
Joined: 16 Feb 2004
Posts: 269
Location: Lees Summit MO
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| Posted: Wed Mar 24, 2004 11:19 am Post subject: |
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| Stroker, thanks for helping out, I know you have more experience with the newer setups, I should have remembered that a device like a fuel pump would already be on a relay anyway. |
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88delta88
Joined: 09 Jun 2003
Posts: 2400
Location: Canada
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| Posted: Thu Mar 25, 2004 10:17 am Post subject: |
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| well... I must have hearing sensitive to that fequency then... I have been able to hear the electric fuel pump in my dad's 94 grand cherokee, my 89 ford probe and I wasnt too surprised I could faintly hear it in my car, but maybe that shouldnt be! |
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86Delta
Joined: 06 Nov 2003
Posts: 281
Location: NJ, USA
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| Posted: Thu Mar 25, 2004 4:01 pm Post subject: |
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| turn up the radio, fixes most noises that i hear. |
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88delta88
Joined: 09 Jun 2003
Posts: 2400
Location: Canada
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| Posted: Fri Mar 26, 2004 10:49 am Post subject: |
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| :-) stereos are good! |
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Cutlass95Ciera
Joined: 27 Jun 2003
Posts: 433
Location: Portage, Michigan
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| Posted: Fri Mar 26, 2004 1:41 pm Post subject: |
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86Delta wrote: turn up the radio, fixes most noises that i hear.
I've noticed that my car doesnt make any more strange noises, well this did start after I got my subs..... :twisted: |
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