Pony Carb Rebuild Installed, Fuel Boiling From Feul Vent

[1965fastback]

I installed my Autolite 1100, Pony Carb Rebuild and set the timming using a vacum gauge acording to their instrucions. When the choke opens up all the way, fuel boils out around the feul vent rod. Checked the needle valve and seat, both were clean and not plugged. Interseting side note, they set the float at 1 inch as opposed to 1 3/32 as called for in the shop manual. Any ideas? Thanks!

65 Mustang Fastback, Jasper Rebuilt 200 I6, C4.

 

[Ba Mustang]

You don't have to post this in multiple places on this forum.

 

[1965fastback]

Well I was tryin to get answers so I guess I got a little post happy, LOL

 

[Ba Mustang]

Yeah. I know about that also. I got in trouble on MF for doing it.

 

[fordconvert]

Are you sure its boiling? How long does it take to open the choke? Try pinching off the fuel line (most cars have a hunk of hose going into the pump) this should reduce the pressure and tell you if its just overwhelming the needle/ float. Refresh my memory, the 1100 float is set upside down? So pony set it higher than stock?

 

[1965fastback]

The float is upside-down and Pony set it higher than stock. Also when I removed the fuel line from the carb there was ALOT of pressure, feul shot everywhere. THe pump is an Airtex from Oreily's that has the 65 factory style filter on top. So how could I regulate or check the pressure it's pumping feul at?

 

[fordconvert]

There was a lot of pressure with engine not running? Is this pump new along with the carb? If its hot enough to boil it would be very uncomfortable to work on anything under the hood. Does yours have a short piece of rubber line going into the carb? If it does thats an easy place to tap in a fuel pressure gauge. Most of the parts stores seem to sell a fairly cheap one that goes high enough for carbs. Also many parts stores rent tools. Look at the gauge if you get one, some of the EFI ones are not calibrated under 10 psi. Most carbs are happy around 3-4. Some of the holleys can take more due to larger floats. I had a new replacement pump on one of my caddies that was running at 8 psi, which is way too much for a q jet. The quality just is not there anymore for most of these parts.

 

[1965fastback]

The pump is new and the carb is a Pony Carbs rebuild, so you could call it new. THe feul isn't boiling, thats just the best way I could describe what it is doing. How would i regulate the pressure if its too high?

 

[fordconvert]

If you can take the pump back and tell em its not right. It would be nice to sort of prove it with a gauge. Other option is a regulator but most of them require a return line and cost at least $50.

 

[1965fastback]

Just tested the pressure and the pump is putting out 7psi of pressure, so the pump is the culprut. Are there any adjustments you can make to the pump to lower it's pressure?

 

[fordconvert]

7 seems a bit high, get a double pumper and you would be set.

Most of the time pressure is set by springs. Either the spring that pushes on the diaphragm or one of the valves. If you could take it apart you may find something sticking or just the wrong spring installed. Problem is most fuel pumps are not made to be serviced. Likely the problem is just low quality springs that are not quite to spec and they dont bother to check them. Now days quantity control rather than quality.

 

[1965fastback]

Alright, I re-installed the old feul pump, pushing 4.5 pounds, perfect!!! My problem is solved and the car runs like top! I love my car again!! THanks for all the help everyone!