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Sudden power loss when tank is near empty???
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Anonymous Poster
Nov 2, 2007, 1:06 AM
Post #1 of 7
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Sudden power loss when tank is near empty???
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It just loses power for a second and seems to have a sudden boost for half second and then it's allright again. Usually at freeway speeds it does this. I'm thinking the tank is dirty or could it be moisture in the tank? Binding valve or clogged injector? Any input or suggestions would be appreciated.
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Anonymous Poster
Nov 2, 2007, 1:10 AM
Post #2 of 7
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Re: Sudden power loss when tank is near empty???
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forgot to mention. I think I have one bad spark plug wire. It has a small chunk missing and it had a burn powder on it. My guess from arcing. Could that have to do with it? I wouldn't think so cause it only does it on a empty tank.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Nov 2, 2007, 3:15 AM
Post #3 of 7
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Re: Sudden power loss when tank is near empty???
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If you are always running around on the cusp of running out of fuel, what do you expect????
That wire has evidence enough to replace it. You can usually buy just one if the whole set is too much for you.
In general: It is hard on "in-tank" fuel pumps to run on low fuel as they cool themselves in the fuel and circulating fuel. Any dirt that stays in the tank would be concentrated with the last bit so use some fuel treatment and some moisture remover periodically and just up and change fuel filters on a schedule.
The price of fuel is no excuse for driving around with a near empty tank,
T
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Anonymous Poster
Nov 2, 2007, 8:54 AM
Post #4 of 7
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Re: Sudden power loss when tank is near empty???
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Thanks bud, that makes total sense. I just was kind of puzzled by the loss of power and the sudden split second boost. I'm in a auto program and really enjoy it and at this stage just trying to fully understand things. I'll heed your advice. thanks again.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Nov 2, 2007, 9:25 AM
Post #5 of 7
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Re: Sudden power loss when tank is near empty???
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Because you are in an automotive program I'll go on to explain what I think is happening in your car. Know that the secondary ign parts are dealing with the high voltage ~ 30,000 to perhaps 65,000 volts at low amps but can make the jump to produce spark. This is really basic as the voltage could care less if it found its way to ground via a spark plug or somewhere else. It will always pick the path of least resistance and that can be that wire.
Why at certain speeds or state of fuel in the tank?? Let's see..... Just look at your engine with hood open and put it into gear and see it move and stay in a different spot by perhaps an inch - like tilting that direction. The load on the engine can tilt/allow a bit more than that too at speed or accelleration unseen while you drive. This could put that spot of least resistance closer to ground without you seeing it. Also, under load the compressed mixture in the cylinder waiting to be sparked takes a bit more force to make the spark jump there as it's denser under load. This again makes the other route to ground more interesting. Keep in mind your can doesn't give a damn if you like it or not it just does what it's forced to by design.
When low on fuel you might have a different volitility of what's left in the tank of the fuel if there's some contamination over years that doesn't just get burned thru and then that same old path of least resistance is at work again. That part was a wild guess on my part but between the two conditions would explain it,
T
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Guest
Anonymous Poster
Nov 3, 2007, 10:26 AM
Post #6 of 7
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Re: Sudden power loss when tank is near empty???
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Thanks for the advice. And the bad plug wire is laying directly on a source for ground now that I think about it. The missing chunk of wire is directly over that ground too. For now, I'll just get some electric tape and block off that path. Fuel fllter is still new and have been using fuel cleaners but nothing for the moisture. I'll do that though and see. Thanks again. THis site rocks.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Nov 3, 2007, 12:41 PM
Post #7 of 7
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Re: Sudden power loss when tank is near empty???
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Electrical tape: If you must repair it use "rubber electrical tape." It's different than the common stuff and is only sticky to itself but thicker which is what you need - and lack of moisture there. Check that product out. It's just like the rubber of an inner tube and you peel off a thin film of plastic - it's not sticky until it touches itself and you can wrap it around stretched and get 1/4" thickness out of the stuff. I use that stuff more for non electrical things than for any wiring,
T
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