1989 Blazer Water In Gas - S-10 Forum
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post #1 of 3 Old 04-24-2019, 07:20 PM Thread Starter
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1989 Blazer Water In Gas

Trying to keep my 4.3L Blazer clean from winter driving, I have been regularly washing the vehicle, including underside. I have somehow been getting water in my gas supply, and it makes for some terrible chugging until the dry gas takes effect.
Are there any key places to check as to how water is getting in system - gas cap, hose connections to tank, etc.?
My first thoughts go toward the side gas door and gas cap assembly.
Cap gasket?
Any thoughts or suggestions?

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post #2 of 3 Old 04-24-2019, 11:36 PM
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Re: 1989 Blazer Water In Gas

Even with holes rusted into the top of the tank or filler neck you must be really pouring the water up under that area for enough to get in and effect the performance. Most current gasoline contains some alcohol which readily mixes with the water and burns. That's all that gas line anti-freeze is, more alcohol.
The only real way to find your leak is to unbolt the bed and tip it to the passengers side so you can look for the hole or busted hose. Has to be near the top of the tank or above for fuel to not be leaking out. If you think it is near the gas cap or door, get a real bright flashlight and small mirror. Doubt the cap is the issue since it completely cover the top of the filler pipe and water won't naturally flow up hill.
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post #3 of 3 Old 04-25-2019, 04:04 AM
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Re: 1989 Blazer Water In Gas

How do you know you're getting water in the fuel? Are you sure it's not sucking water in via a intake manifold or other vacuum leak? I've seen that a few times... when the undercarriage wash hits the bottom of the engine, a vacuum leak manages to suck in a bunch of water and either stalls the engine or makes it run like poo for a minute or two. I've seen similar instances that were result of a torn diaphram in the EGR valve too.

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