[HWYSTR455]

Keep telling everyone, just go electric, 1/2" hard lines as much as you can, leave little rubber as possible, AN connectors, bypass regulator, in tank pump.

I went through this years ago and bailed, never looking back. Been very successful results, same with many others.

As more and more cars go efi, it's only going to get worse. And replacements will become 'specialty' items with the prices skyrocketing. It's actually surprising mech pumps are still being made, the only requirements still in place is like 7 years, manufacturers are going to dump the mech pumps soon, there's no money in it.

If you want the OE look, gut a mech pump and just run a line thru it, hide the regulator. If you're not showing the car in a judging circuit, it doesn't matter, you're just being stubborn.


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[tstroud]

Originally Posted by HWYSTR455

Keep telling everyone, just go electric, 1/2" hard lines as much as you can, leave little rubber as possible, AN connectors, bypass regulator, in tank pump.

I went through this years ago and bailed, never looking back. Been very successful results, same with many others.

As more and more cars go efi, it's only going to get worse. And replacements will become 'specialty' items with the prices skyrocketing. It's actually surprising mech pumps are still being made, the only requirements still in place is like 7 years, manufacturers are going to dump the mech pumps soon, there's no money in it.

If you want the OE look, gut a mech pump and just run a line thru it, hide the regulator. If you're not showing the car in a judging circuit, it doesn't matter, you're just being stubborn.


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I have had the same results recently. I thought I made a mistake on the Q jet rebuild since It was leaking fuel and stinky rich at idle. So I bought an Aces TBI setup to replace the Q jet. I put a tanks inc. tank with a Walbro pump, AN lines, fuel pressure regulator and fuel filter on the GTO in preparation for the TBI. I regulated the fuel pressure down to 5 psi to temporarily run the Q jet and now all my carb problems seemed to go away. I had the Carter big can mechanical pump on there and I think between the higher pressure and the pulses it was overpowering the needle and seat.
It runs nice now but I’m probably still going to install the TBI since it’s setting on the bench with the warranty ticking away.

[mgarblik]

I looked through the 1968 factory shop manual for you. Unfortunately, for 1968 there is really no mention at all about the fuel tank and or the engine fuel venting system. Generally, the AC cars had a return line with a restriction in the 1/4" line near the fuel pump. The restriction in the line was quite small. If memory serves around .040-.045" hole There is usually only a small dribble of fuel in the vent line. Not absolutely sure but I think 68 would have a vented gas cap, essentially open to atmosphere. The carb float bowl is vented as well as an extra vent lever operated to be open at idle. Sorry, but that is all I could find .