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#1
10-04-2005, 08:12 PM
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Fuel tank not venting properly?
Whenever I remove the fuel cap after driving my 91 Caprice any distance, the tank has a vacuum condition. The car also seem to hesitate at slower speeds. I'm thinking the fuel tank is not being properly vented. I bought a new gas cap from the general, but that's not the problem. I bought a second one in case the first was faulty, but the condition still exists. Has anyone else ran into this problem or have an idea of what may be causing this? I don't have a service manual yet to familiarize myself with the fuel system, as I just bought the car (has 103,000km on it now). Thanks. Tom
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1949 Chevrolet 1433 (Canadian 1 ton cab and chassis single rear wheel pick-up truck) 1968 Pontiac Parisienne (rust free survivor) 1973 Buick Centurion (four door hardtop; engine will be donated to our 1949 1 ton truck) 1989 Chevrolet K3500 RC/LB (454 & single rear wheels) 1991 Chevrolet Caprice Classic (police cruiser clone) 1992 Chevrolet K2500 EC/SB (almost rust free daily driver) 1998 GMC C1500 EC/SB 
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#2
10-04-2005, 09:51 PM
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ok i have the same car, do you mean when you take the gas cap off it sounds like it is farting lol? b/c if that is what you are talking about then everything is fine, a fuel system on a car is a sealed system witch means nothing can get in and nothing can get out. that way you dont get dirt or that kind of stuff being sucked in your motor, as far as it being sluggish on the slow seeds i also had this problem all i did was change the fule filter and everything was better. i hope this helped
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#3
10-05-2005, 01:36 PM
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Re: Fuel tank not venting properly?
You got quite a collection of cars pontiac. Can you get a vented gas cap for that? There has to be a vent somewhere cause when the gas comes out air goes in.
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ASE Master Certified before the age of 20 Current Cars: 2001 Chevy Silverado 1500 Z71 5.3L 1996 Acura Integra LS B18 1.8L Past Cars: 1990 Buick Estate Wagon 5.0L 1987 Chevy S10 2.5L Tec Four 1995 Pontiac Grand Am 2.3 Quad 4 1996 Jeep Grand Cherokee Limited 5.2L AWD 1991 Ford Tempo L 2.3L 1992 Buick LeSabre 3.8L 1997 Buick Century 3.1L 1996 Lumina APV GT 3.4L 2006 Ford Escape 3.0L XLT
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#4
10-05-2005, 05:33 PM
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The car has a new fuel filter and the gas cap was bought from GM last week specifically for the 91 Caprice. I'm going to try it on my sons 91 Buick Park Avenue and see what happens. None of my other fuel injected, or carburated, cars have ever had vapour lock, so I thought it might be something serious. I'll check they installed the fuel filter in the correct direction before I try replacing it. Thanks. Tom
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1949 Chevrolet 1433 (Canadian 1 ton cab and chassis single rear wheel pick-up truck) 1968 Pontiac Parisienne (rust free survivor) 1973 Buick Centurion (four door hardtop; engine will be donated to our 1949 1 ton truck) 1989 Chevrolet K3500 RC/LB (454 & single rear wheels) 1991 Chevrolet Caprice Classic (police cruiser clone) 1992 Chevrolet K2500 EC/SB (almost rust free daily driver) 1998 GMC C1500 EC/SB
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