So, I get a sputter at just before the 2ndaries open up...it will keep sputtering until I floor it then it will take off after a second. Is this restricted flow? I have riched up the rods and jets to the max of my calibration kit, and it still does it. I am going to try to borrow Rolandag's 650 Holley DP and see if it goes away...Still feels like a carb issue, not a fuel flow. I was looking at that Mallory on JEGS. That is probably what I will get when I replumb everything. By the way, Got the fuel pump mounted back to the frame rail on 2 hanging brackets and with rubber grommets on both sides of the mount...SILENT!!!
If memory serves me on the Holley blue pump...(I used to use these back in the 90's in my drag car) they had in internal bypass valve that would need to be blocked off. That way you would be sure that the bypass regulator is actually bypassing the fuel and not the pump itself. I have seen first hand that these valves in the pump can stick. Just a thought for you.
So can the vent tube from the charcoal canister to the tank be used as a return line. I am running a mustang fuel tank without the vent inlet. I'll be modding the stock sending unit for a return inlet. I am using the stock fuel lines for now so I believe they are the same size.
A vented cap is only vented when you are on level ground or not accelerating. Even with a vented cap you need a vent line from the top of the tank. Unless you like spilling $4 a gallon gas on the street instead of burning it in your engine.
Please forgive my ignorance here but if the vented line is required then why didnt the 60's mustang tanks come with them. They only had the vented gas cap. Where would I be loosing fuel from? The vented cap itself or is there something else I am missing. If just the cap then I think that is something I can live with for now. here is the sending unit for EFI conversions. There is no mention of needing additional venting for this conversion. http://www.ronmorrisperformance.com...ct_Code=9112&Category_Code=Fuel_Sending_Units
I would think that you could use the steel vent line, it's 5/16" or 3/8", but the issue would be where it ties back into the tank, those vents must be some sort of a check value? I'll have to out and check one on a spare tank. That sending unit looks like they just drilled a hole in it, and welded in a stub.
Not using a maverick gas tank. The tank is a mustang tank which does not have the venting in the top like the mav tanks have. There is no vent in it at all.
The vent in the Mustang tank was in the filler tube, I believe. I will have to go check mine to be sure.
I saw that it was the Mustang tank, but you still have the stock return line? I would think it would work, theres lots under the car to tie into. Keep us posted on this, I'm thinking about putting fuel injection on my 74. (I'm thinking and typing at the same time, sometimes I get confused)
Just an FYI but I am not converting to EFI, just stepping up to a electric fuel pump (holley blue) and would like to have a return line. If you are wondering, I have a holley bypass regulator. 12-803BP
If you are using the Mustang tank, and you will use the existing car's vent line that is not now connected to the tank, and you connect it near the top of the tank, I can see no reason that it will not work.
