Fuel system update on 67 Coronet 440cid

[mopar67440]

Geoff2. Thanks for the fuel pressure vs float level chart. The AVS2 carbs have stock needle and seat, so I will be adjusting my PSI to the 5.5, adjust float level based on chart and go from there.

lewtot184...what did you use to create the 0.040" orifice in the 1/4" return line? Any pics of the insert?

Anyone have a preference for fuel sending unit mfg'r? I'm leaning towards Spectra. I'm going to drop the tank and get pickup and float adjusted best I can then compensate with the meter.

 

[lewtot184]

The fitting in right photo is combined with a 1/8"-1/4" pipe bushing that connects to the fuel log. 1/8" tubing is connected to the right photo fitting and from there connected to 1/4" return line. I used the factory pick up set up at the tank. Soldered a piece of 1/4" tubing in the pick up flange. Pretty simple. The .040" return orifice is a trail and error number; nothing wrote in stone.

I used a spare block with cam, fuel pump and push rod installed and drove the cam to do flow and pressure testing. Tested several pumps for pressure and timed free flow. Definitely not a scientific experiment but gave me a lot of info to run on. Keep it simple. Don't blow a bunch of money on this. Take a que from what the factory did.

 

[mopar67440]

So looks like you took the 1/4 compression fitting and soldered up the opening then drilled to taste.
Perfect! Thanks

 

[lewtot184]

So looks like you took the 1/4 compression fitting and soldered up the opening then drilled to taste.
Perfect! Thanks

it's an inverted flare fitting

 

[mopar67440]

Got it!

 

[lewtot184]

Something else i did was tie a pressure gauge on a windshield wiper arm and go out and do some test runs to verify my changes. Kinda hillbilly but it worked ...lol!

 

[TN Mopar]

I had a different system
Electric Mallory 140 pump 1/2 inch line to the carb
but I got tired of the fuel gauge never reading right
So I redesigned everything
I went with a Tanks Inc. EFI Tank and in-tank fuel pump and the floatless sender
This system is so much quieter!
1/2 inch line to the regulator, 3/8 lines to the fuel log, 3/8 return line
(a bit of over kill perhaps but room to expand)
Advantages of this system were:
1: much quieter
2: working fuel gauge
3: improved filling (better tank vent)
4. better fit under car (no big pump mounted underneath)

This more than feeds my 500 HP 11 sec car