Question about 1991 Chevrolet Camaro

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Excesive gas tank pressure when loosening gas cap on a 1991 camaro with 3.1 v6

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Get yourself a vented gas cap .

Posted on Mar 19, 2011


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2003 Chevrolet Silverado 4.3 V6 with MFI. Engine ran not start.

Well it could be numerous if things but you want suggestions...So here's mine..Your gas tank might be vapor locked...This is caused from over filling your gas tank with gas over the years..Its when the pressure in your gas tank becomes greater than your fuel pump. It wont start until the pressure in your gas tank becomes lower then you fuel pump...Sounds crazy...This got me once...I didn't understand it...A lot of people (including me) Go to the gas station and get that extra 50 cent after the gas nozzle clicks off...over time that extra gas will run down the vapor lines intended to burn fumes....Like when you fill a gas can to cut your grass...If you sake the gas can it builds pressure and bows up. But with time that pressure will go away...Well saying that...Your gas tank needs to vent to....So your car burns not only gas but fumes...If you keep over filling your car with the extra gas it cloggs up your vapor canister intended for fumes or vapors...The gas will will go into that canister and clogg up the charcoal that's inside it. (Breaks it down) then the vapors can't get to your carburetor where it supposed to burns it. So what happens is the pressure in the gas tank becomes greater than your fuel pump and then car won't start..Are you with me? Lol Its crazy..Putting a different gas cap can cause the same thing...Simple test...When you open your gas cap to get gas.. Do you heat air sucking in.. Yes you can hear it....A lot of times loosening the cap let's the pressure out and the car will start right up.....Thus might not be your problem but worth telling at the gas pumps to other people..... Just trying to help

Jul 01, 2017 | 2003 Chevrolet Silverado 1500

1 Answer

I have a 1989 iroc Camaro 5.7 multiport. just installed a new engine. ok car runs fine I dive it to work and that's about 25 miles. for got to say I also put a new fuel filter and fuel pump in. about 1/4...

If you replaced fuel pump, you should have checked orientation of float to make sure it doesn't hit a baffle or anything.
You can use resistors to see if fuel gage reacts properly to the resistors, 90 ohms is full
0 ohms is empty. The wire colors for sending unit are pink and black. Take connector loose, use resistor between proper terminals, key on. If the gage reacts properly, the problem is in the gas tank.
Use a gage, check proper fuel pressure, 34--47 psi.
As far as pressure in the gas tank, check evap system where applicable or vent tube.

Apr 09, 2017 | 1995 Chevrolet Camaro

1 Answer

1991 camaro rs 3.1 v6 loss of power

Have you checked the fuel pressure ?
Is the check engine light on ?

Jul 28, 2012 | 1991 Chevrolet Camaro

1 Answer

My 2001 3800 V6 Camaro ran out of gas, and now it wont start at all... replaced fuel filter... still nothing... bought a brand new fuel pump, how do I install it myself?

You have to pull the gas tank out of the car. To do this, first disconnect the ground cable from the battery to make sure you have no power that could cause a spark. There are probably two fuel lines that you will need to disconnect from the tank. A preasure line and return line. You may need a special tool for this that can be puchased from any parts store. It also would be a good idea to syphon as much fuel as you can from the tank. Loosen the two straps holding the tank in and drop it down using a floor jack. Lower it just enough to get to the wire loom and unplug that from the fuel pump. Once you get the tank out, The is a ussually a spanner nut or large snap ring holding the fuel pump in the tank. loosen that and remove the pump from the tank. Just reverse everything for reasembly.

May 12, 2011 | 2001 Chevrolet Camaro

1 Answer

Excesive pressure in fuel tank

fuel caps have pressure release and vacuum release built into them. 1/2 psi will be quite common and be more noticeable on an empty tank in hot weather. If higher. replace fuel cap

May 31, 2010 | 1999 Jeep Grand Cherokee

1 Answer

Every time my mother in law fills up her 2003 KIA Optima LX V6 with fuel it dosent want to start .She took it to a licensed mechanic and $576.00 later it still did not solve the problem .Any info on this...

Don't overfill the tank! Sometimes this can cause a overload of the fuel vapor recovery system. This can sometimes lead to a no start problem. Also make sure the gas cap vent isnt plugged.

Try this next time this occurs. Loosen the gas cap and see if it "burps" off a bit of excess pressure. With the cap loose, cycle the key on and off without starting the engine. Replace the cap and try to restart.

Dec 15, 2009 | 2008 Kia Optima

2 Answers

98 camaro 3800series v6 engine will turn over but not star.sometimes it will start and run fine,but when you turn it off it won't start again.have changed fuel filter and fuel pressure regulator,no check...


Oct 25, 2009 | 1998 Chevrolet Camaro

1 Answer

Have line unhooked from fuel filter. turn key on and fuel pump pressures up and no gas comes out of lines.

It sounds like there is a blocked fuel line closer to the tank - or....
there a cut-off valve fitted just after that?

Where is the pressure sensor? - because there is pressure at that point. Sometimes there is a fuel cut-out switch that trips in the event of impact. If your model has one fitted - press the red cap to reset it.or go looking for a solenoid on the fuel line.

Aug 07, 2009 | 1991 Chevrolet Camaro

1 Answer

I unbolted my gas tank but it wont come off the

disconnect tank fill neck,
supply and return lines,
electrical connection for fuel pump...

Feb 22, 2009 | 1994 Chevrolet Camaro

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