Looking for someone that carrys the proper clips for a 68 bird 400 with AC. 2 lines one supply one vapor return. The clips press into holes in the frame and carry a 3/8 line on top and the 1/4 inch return on the bottom. So far no one seems to have the right one I can post a pic if needed.
It is going to have a 428 with an a holly avenger to start with then once its rebuilt a year correct quadrajet. As far as how it will be driven it will be summertime occasional driver for my wife and a weekend warrior for me.
Pontiac put fuel + return lines on all 400 cars, I suspect there was a reason. 400s tend to run warmer, and do tend to boil off fuel in the intake after shutdown.
Vikki 1969 Goldenrod Yellow / black 400 convertible numbers matching
I believe the 400s came with a bigger pump capacity so they included the return line to bleed off the un-needed gas. The single fuel line was enough for the 350 2bbl that mine originally came with but couldn't keep up with the 400. I suspect it won't keep up with the 428 either. So it's either add the return line and the bigger pump or go elect like I did.
Well I was actually planning on adding an electric anyway cause I hate grinding on the starter after a vehicle has been sitting for a while to get gas up to the carb. Can't imagine an engine using more gas than a 3/8 line can provide. I am putting a high flow 455 fuel pump on it. I guess I can always add the second line although I don't remember the tank having a return line fitting.
The sender probably doesn't so you'll have to replace the sending unit also with one that has the return line.
I don't think it's so much that the motor uses more than a 3/8 line can give as much as it can use more than the fuel pump can provide. The pump being the weak link here. At least that was the case for me.
I went with a Holley Red. Internally regulated. Pressure set for NA cars. And I didn't have to replace the pu/sending unit or add a return line. No more parasitic drag on the cam eccentric. Only thing is it's a little noisy before I start up but at least I know when it's working. All good.
Thanks Yellowbird P/N CLP113 is the one I am looking for will order on Monday. Firebob did you run it through the original fuel pump? I've seen where people will install the Holley pump under the car inline with the fuel line then run it straight through the fuel pump to keep the stock look. My question I guess would be do you gut the stock pump to do this?
One danger of running the electric pump through the mechanical is the danger of rupturing diaphragm in the mechanical and mixing gas with the oil. There's really no "stock looking" way to get around it since it needs a shuttle valve in the line. A high-pressure pump isn't available - as far as I know - for our old iron.
The electric pump should be placed below the tank and as close to the tank as possible, hence the location under the car. And, since there's more room for it near the rear end ...
Wire the electric to the key so that you don't get surprised on the first freeway on-ramp you hit.
I pulled my mech fuel pump off and used a block off plate. The line still comes from under the pump so if you left the mech on there you would basically have to crawl under the car to see if it was hooked up or not(if you reeeally wanted to). I'm not a big originality freak so I could care less. Anyone crawls under my car without my permission is gonna get my foot up their a$$.
My original plan was to install the electic to a seperate switch so I can prime the fuel system when the car sits for extended periods. I guess I could always rewire to ignition and bypass the manual pump if it can't keep up.
