Gas cap vent

[Doug&Deb]

I’m still fighting a fuel starvation problem with my Coronet. One thing that was mentioned is the vent in the cap. I understand that a clogged vent is bad but what about too much air getting past the cap. My cap is original and fits loosely. The cork is mostly gone. There’s also a bit of leakage around the sending unit. It’s a new tank and gasket but seeps when I fill the tank. Could either of these be causing any issues?

[Sniper]

Too much air isn't an issue.  Fix the leaks, those are potential fire hazards.

[Doug&Deb]

For sure. 

[D35 Torpedo]

Leaks will allow foreign material in as well.

[soth122003]

2 hours ago, Doug&Deb said:

I’m still fighting a fuel starvation problem with my Coronet.

If you are positive that it is a fuel starvation issue, I would look at the fuel pump. lines and the in tank fuel filter. If the fuel pump is good, blow air into the line from the pump input line back to the tank. Look for pinhole leaks while doing this. Should be evident by a spot of fuel at or near the leak if a hole is present. If there are no leaks present this will also blow any crud that may have clogged up the tank filter. If you pull the sending unit you may see cloudy gas after blowing air into the tank that may indicate the filter was part of the problem. I also would advise using a low pressure about 15-20 psi so as not to damage anything in the fuel system.

 

Pay special attention to the rubber line from the steel line to the fuel pump. It can look great on the outside, but the inside could be toast. The most common failure symptom of that line is it idles great but at speed the engine stalls. 

 

If you run ethanol gas in your car, check the carb for a greenish powdery residue in the float bowl. If present, clean the carb. The residue is a result of the ethanol gas evaporating away, leaving this corn residue that can clog up small ports in the carb.  These are about the only problems I can think of that would cause a fuel starvation issue in these cars. I hope this helps in you trouble shooting endeavors.

 

Joe Lee