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2nd Gen S-series (1995-2005) Tech Discuss 2nd generation s-series (1995-2005) general tech topics here.

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Old 05-04-2010, 07:23 PM
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Default Raw Fuel Smell

I searched and didnt really find anything. Sorry if this has been covered.

But anyways, I have a 1996 2 door 4wd blazer with about 80,000 miles on it. The other day i started to smell a strong gas smell when driving with the windows down. When parked and idling or even revving the engine a bit i dont smell anything.

I changed the fuel filter and air filter about 5,000 miles ago and, cleaned my throttle body Saturday.

Theres no visual leak from the top of the tank, evap system, fuel filter, or even the lines going into the intake.

I took the evap canister out and that seamed fine no problems there.

Also I'm getting about 20 mpg right now so there no major loss in gas mileage, and the truck runs great, no idle jumping and no problem with acceleration.

Im just kinda stuck and im not sure what else to check.
Old 05-05-2010, 04:37 AM
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There could be a leak at the fuel pressure regulator inside the intake itself. This is a common problem on these trucks.

However you would usually be able to smell any kind of fuel leak (even into the intake) from outside the truck when it is running and you are not moving. So are you positive that the smell was coming from your truck and not another car on the road with you?

Sorry but I gotta ask that one since it happens a lot with both fuel leaks and coolant leaks. I have had many owners try to have me track down a fuel or coolant leak smell that ended up not coming from the vehicle that I'm actually working on.

Also aside from checking for a internal leak into the intake, check your fill tube to your gas tank as well. Cracks and corrosion there can cause a fuel odor when your driving.
Old 05-05-2010, 10:51 AM
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I know for a fact it's coming from my blazer. I can smell it everytime I'm driving in the past week or so.

It does have a older one size fits most gas caps. When I filled it up last night it was alittle lose and kinda weird. Could you smell gas vapors from the tank when driving?
Old 10-24-2011, 08:24 PM
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Just recently had the same problem. Thought maybe it was the evap canister, but thought I would drop the tank anyway just to check for leaks. Well, it turned out that whoever replaced the fuel pump last, broke off the fuel tank vapor valve. The part that goes into the small hose was broken off right at the valve. There is one located at the front and rear on top of the tank. The rear one is right by the fuel pump and is exactly like the one at the front. About the only way to get at it is by dropping the tank. Anyway, that what was source of the fuel odor on mine. It's a 95. The part cost about $22.00 and I also put a longer length of hose back on.

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1995, blazer, canister, chev, chevy, evap, fuel, gas, intake, loss, milage, raw, revving, smell, strong

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