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Old 06-29-2014, 05:18 PM   #1
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Possible water in gas tank

I broke camp this morning and after driving about 75 miles we started climbing some hills. The engine started surging and missing when putting a load on the engine. Thought it would stall. Pulled over and engine ran great with no load, even at high rpms. Took off again and ran fine. A little while later, same thing. If I didn't floor it it seems to be okay. Stopped for gas and noticed my gas cap was missing. Since we have had 3 days of steady rain, I think water may have gotten into fuel. How would I be able to tell if water is in fuel? If there is some water, what can I do? Change filters, drain tank, ??? If I add more fuel would it delete the water?
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Old 06-29-2014, 05:49 PM   #2
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While you may have water I bet it's your fuel system. I see you have a P chassis. Are your fuel filters recent? Your '90 may be an '89 with a carb?

Just water, some water eliminator in a can will help. Seafoam is just fine for that.

I just cleared the same symptoms on my '87. New filters and a new in tank pump.
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Old 06-29-2014, 06:18 PM   #3
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Thanks dondee, your right, at first I thought it might be something in the fuel system such as filters fuel pump etc. but once I saw the cap off I had reason to believe it might be water. It very we'll could be in the fuel system. I'm trying to look at easiest first. I'll try you recommendations.
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Old 06-30-2014, 12:26 PM   #4
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When was the last time the spark plugs were changed? Worn spark plugs are notorious for causing a hesitation under load.
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Old 07-01-2014, 09:31 PM   #5
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I filled with fresh fuel and changed fuel filters and ran great up to yellowstone. Thanks to all.
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Old 07-20-2014, 04:40 PM   #6
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Quote:
Originally Posted by Robertandkim View Post
I filled with fresh fuel and changed fuel filters and ran great up to yellowstone. Thanks to all.
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Old 07-20-2014, 07:46 PM   #7
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Ethanol fuel adsorbs water like a sponge. A fill up of fresh fuel is usually an easy fix.
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Old 07-20-2014, 08:29 PM   #8
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Ethanol fuel fuel all so seem to kill paper fuel filters every 6 months it seem

i at one time had 14 GM trucks running under me that had the older carbs setup
this help alot and saved time is to pull the card filter out and drill a small hole in it to let fuel bypass the filter but kept it installed for the one way valve so fuel would not run back down the the line .... then installed a out side inline fuel filter at the carb
it was a see inside type and every 6 months installed a new one
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Old 07-20-2014, 09:18 PM   #9
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This works

We used this in the marine industry with good results. Contains no ethanol which is a hygroscopic (attracts water). Glad you got your rig running well again.
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