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V70 Gas Gunk, and wires IN THE TANK.

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grovechef
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Year and Model: 2001 V70, T.2.4
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V70 Gas Gunk, and wires IN THE TANK.

Post by grovechef »

are1.) What is that gunk and how could it possibly have gotten there?
2.) How come electrical wires are bathing in gas?
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grovechef
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Re: V70 Gas Gunk, and wires IN THE TANK.

Post by grovechef »

I am sorry.
Somehow the whole preceding narrative went to another planet. I will try again tomorrow.
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abscate
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Re: V70 Gas Gunk, and wires IN THE TANK.

Post by abscate »

Pumps and wires have been in gas tanks for about 35 years now - its common practice. Gas is explosive over a surprisingly narrow range of conditions, Hollywood movies excepted
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kranz
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Re: V70 Gas Gunk, and wires IN THE TANK.

Post by kranz »

Something that was a surprise to me is that gasoline is a poor electrical conductor. So bare wires can be submerged quite happily without fear of shorting something. Gasoline vapor and an electrical spark is a different story. The phrase "hilarious consequences" comes to mind.
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Re: V70 Gas Gunk, and wires IN THE TANK.

Post by oragex »

Interesting explanations. Always keep in mind that gasoline is extremely volatile (much more than diesel) and vapors are extremely inflammable. Makes me remember of a Honda owner several years ago, the Honda gas tanks were prone to rust, he removed it, emptied it, then went ahead trying to mig weld a patch to it :shock: :shock: :shock: He lived to tell us how the tank went flying

Anyhow, about the gunk inside the tank, not many ways, I assume the tank was already opened - maybe to remove the pump or the float, and some rodeo guy did the whole job ?

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Re: V70 Gas Gunk, and wires IN THE TANK.

Post by matthew1 »

abscate wrote: Fri Sep 27, 2019 11:45 am Gas is explosive over a surprisingly narrow range of conditions, Hollywood movies excepted
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Re: V70 Gas Gunk, and wires IN THE TANK.

Post by kranz »

oragex wrote: Fri Sep 27, 2019 3:15 pm Makes me remember of a Honda owner several years ago, the Honda gas tanks were prone to rust, he removed it, emptied it, then went ahead trying to mig weld a patch to it :shock: :shock: :shock: He lived to tell us how the tank went flying
Back in my youth I once did a stint as a factory worker. During this time one of my co-workers told me about a welder on a rather seedy side of town that allegedly repaired leaking fuel tanks. He said the guy would fill the gas tank to the top with gasoline leaving no air pocket for gasoline vapor to form. Then he went at it with his welding rig. Supposedly it was a sight to behold, with a dramatic display of smoke & flame but no pyrotechnics. Even if true, it still would have been an extremely dangerous undertaking. I never knew if this guy was telling me the truth as his stories were prone to embellishment. Given my inexperience of youth I suspected my co-workers frequently felt compelled to test my level of gullibility.
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Re: V70 Gas Gunk, and wires IN THE TANK.

Post by jimmy57 »

"gunk" is not very precise. dirt/sand? gummy residue on tank? cottage cheese looking stuff floating in tank? debris on the pickup sock?

Years ago myself and a couple of co-workers had to satisfy our curiosity and took a removed in-tank pump that had gasoline still inside and attached a 10 foot long twin lead to give it power and ground and powered it up and let it sit on the pavement away from everything. We waited and waited for the big bang. After it ran for at least 10 minutes, the last 5 of that with it squealing and jumping from lack of lube (the gasoline it is filled with normally) it finally jumped about 6-8 feet like a weak bottle rocket with a little bit of fire. The brushes for the motor run in the cavity the fuel runs through and we knew it would explode quickly outside the tank. Nope.

I have worked on a few cars where the wires in tank shorted to each other and nothing happened other than the car surging and jumping until the wires made enough contact the blow the fuse. Inside the fuel tank it is too rich to combust easily or even at all. After all these years of those tens ((hundreds?) of millions of vehicles with electric pumps in the fuel tank we have never had cars blow up. The car fires some models have been afflicted with were leaking outside tank, usually in engine bay.
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