i need help bad i have a 86 vette stock engine problem that im havig the fuel lines produce to much air and car dies u can hear the air coming out of the gas tank and it happens when u run it for a couple of hours and for the car to start u have to get the air out of the fuel lines anyh body else with this kind of problems

 

put gas in the tank

 

the tank its almost full has a little more than 3/4 of tank

 

if run it for a couple of hours then u park it u can hear a lot of air coming out of the gas tank and this morning i was driving on the freeway and all of the sudden it just die on me had to pull to the side open the hood and bleed the air out on the injector rail valve

 

Sounds like a ventilation issue. Check your gas cap (I'm not even sure if it is vented, but I'd think it is - vented to let air in (somebody will correct me if I'm wrong) and then I'd check your emissions evap system. That's where I'd start and then go deeper - fuel pump, fuel lines, fuel filter. Did you do any repairs recently that might have caused this problem?

 

fuel pump its new also fuel filter and the only thing i did to it was replace spark plug wires

 

not vented , closed system

 

not vented ok so what do i do in this case to fix problem thanks on advanced

 

loosen the fuel cap and go for a spin, this should either clear or confirm the ventilation system.

 

so this means i have a bad gas cap ok ill just buy a new one and try that thanks ill repost to see how it goes

 

him loosening the cap and going for a 'spin' is only venting a non vented system, wont prove anything. none of these C4's have vented systems. the only way to get air into the fuel lines is thru the pump, past that its a pressurized system, if it had leaks he would see fuel coming out.
to the op, have you pulled the fuel pump and checked where the pickup is in relation to the bottom of the tank.

 

Double check, but I think you will find that the vent system is closed. The fuel cap should have both a pressure relief valve, and a suction relief valve for safety reasons...not for primary venting. If by loosening the cap this clears your problem there is more trouble shooting that needs to be done most likely.

 

good point

 

Easy friend....this is only a test....

 

sorry, didnt mean to sound testy.

 

Actually, alaskaman - the gas cap is vented (as I expected it should be)...otherwise the gas tank would collapse as the fuel is being used. It's a one-way valve to let air in.

To the OP...you indicated that the fuel filter and fuel pump are new...how new? Has this problem started since either was changed? If so, there could be a number of things that happened that would cause the problem. Do you smell gas? Any leaks? Lines connected properly, 0-rings in place....

 

 

I bought the car not that long ago but had it in the shop doing a paint job on it so when I had it there I decided to get everything new as like the fuel pump fuel filter spark plugs and wires cap and rotor even coil and module oil change radiator flush did everything on it today is my 3 rd day driving it and now this air ibm tank isue don't know what to do now like i said got everything new

 

If there was pressure (air) in the fuel rail and bleeding that off to reduce the pressure, allowed it to start up again...

Change the perspective a bit and see that as a VOID and not simply air. If there was pressure the pump was pushing something....where it went...?
Odd because this system needs 40 psi of fuel pressure to run. Air in the rails will not burn in the combustion chamber. I'd say that a fuel pressure test gauge would be a great idea...

But, if it was air pressure in the rails....
there are only 2 possible ways that can happen.

Either the pump is NOT pushing fuel because the pick-up screen or intank sock is plugged up, and the pump is just pressurizing whatever is in the line since it cannot suck up gas, (which will burn it up quick)

OR

the fuel is being used or is escaping the rails faster than the pump can replace it, leaving a void in the rails.

Just a guess....but are you 100% positive that you reconnected the fuel lines correctly to the tank pump/sender assy ????????????

The pressure line is at the top of the assy plate, the return line toward the bottom right, and the vapor line is at the left lower corner.

Is the charcoal can still inplace with all of its plumbing in the driver side headlite well?
You need all that...in case someone went "bubba" on the vapor recovery system.

 

I vote for this one