s-10 warm weather problem

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shadetreemech - 12 Jul 2008 14:10 GMT

My son has a 95 Chevy s-10 pickup with a 4-cyl since we changed the fue
pump and filter he has a problem it dies as if it is running out of ga
when temp outside temp is above the upper 80s he waits 10-15 min it fire
up and goes. It sounds like vapor locking but is that posibile with fue
injection? I have not been around when it happens. Thanks for any idea
Lann

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GKShadow - 09 Aug 2008 19:10 GMT

Sounds like the fuel pump, it wont be long before it just wont start at all.

> My son has a 95 Chevy s-10 pickup with a 4-cyl since we changed the fuel
> pump and filter he has a problem it dies as if it is running out of gas
[quoted text clipped - 7 lines]
> http://www.talkaboutautos.com/group/alt.autos.4x4.chevy-trucks/
> More information at http://www.talkaboutautos.com/faq.html

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Steve W. - 09 Aug 2008 20:57 GMT

> Sounds like the fuel pump, it wont be long before it just wont start at all.
>
[quoted text clipped - 6 lines]
>>
>> --

Throw a pressure gauge on it. Monitor the pressure with the pump on and
watch the pressure drop when you shut off the key. If the pressure drops
fast you will need to check a couple things. One is the pressure drop
through the pump itself, the other is for the pressure drop through the
regulator. Could also be that the new pump isn't any good.

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Steve W.
Near Cooperstown, New York

Life is not like a box of chocolates
it's more like a jar of jalapenos-
what you do today could burn your a.s tomorrow!

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shadetreemech - 20 Aug 2008 01:55 GMT

Thanks for the ideas the fuel pump was replaced last fall. He was usin
ethanol he switched to just regular unleaded and has not had a problem i
over a month. Lann

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Steve W. - 21 Aug 2008 01:58 GMT

> Thanks for the ideas the fuel pump was replaced last fall. He was using
> ethanol he switched to just regular unleaded and has not had a problem in
> over a month. Lanny

It will come back. The Ethanol lowers the boiling point of the fuel. The
lack of pressure going through the system allows the fuel to boil even
faster. Run the tests on it and see what you get. I'll bet you find a
low residual pressure.

Oh and I just had 3 bad pumps in a row, straight out of the box. One was
a GM factory pump (pressure slowly dropped over a 10 minute period, near
as I could tell the motor was starting to fail) The next was a Carter,
that one had a bad return valve and the main line leaked, the last one
was an Airtex - It had a bad regulator on it.

Oh and all three were Made in the US!

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Steve W.
Near Cooperstown, New York

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