-6an fuel check valve

[GregWeld]

Just FYI -- Fuel pumps like to have a flooded head. Personally I'd look at other install options before putting a bandaid on it.

[vstol]

Originally Posted by GregWeld

Just FYI -- Fuel pumps like to have a flooded head. Personally I'd look at other install options before putting a bandaid on it.

Greg what a flooded head and how far below the top of the fuel cell is good enough not to worry about a check valve

[GregWeld]

Assuming you're using an electric pump.... they PUSH fuel rather than Draw fuel.

Are you taking fuel out of the top of your tank?? Give us something to work with here... LOL

[GregWeld]

Sorry - forgot to answer your other question -- A flooded head is when fuel is flowing TO the pump on it's own... and from there the pump pushes the fuel.

[vstol]

Fair enough and thanks for your comments. The current plan is to use a inline Holley Elec fuel pump 12-890 which will require to pull the fuel from the top of the fuel safe cell. I can not have it much lower than the top of the fuel cell and it will feed a C6 corvette fuel filter and regulator. Weldon tech advised me to use a check valve if the pump is not below the top of the tank. I would assume if I can get it lower than the top then a check valve but not sure. Thoughts

[GregWeld]

Sometimes bandaids are all that can be done. The pump will pull fuel and the check valve is a must IMHO lest the pump run dry every time you fire up. I'd try to keep the suction side as short as humanly possible... as in a foot or so. You may also want to increase that short supply side to a -8 so there's more volume of fuel to start with.

[vstol]

Greg in order to avoid the check valve how far does the pump have to be below the top of the fuel cell to avoid using a check valve? Also the feed line will be -8. thanks

[GregWeld]

You'd have to be taking fuel from the bottom of the tank (or near the bottom). As it is - if you're taking fuel from the top fitting on the tank you're already "lifting" the fuel so as the tank empties - you're lifting it ever higher. That's okay back when everyone was running MANUAL fuel pumps because they were built for suction. Electric fuel pumps are built to PUSH the fuel and this is when the issues start. With the volumes and pressures that are needed for fuel injection and the fact that you don't have a "fuel bowl" for a reserve you can't have hiccups in the fuel delivery system.

I'm no expert in this and was hoping that maybe someone else might chime in here and lend some "expertise". When I switched to EFI cars years ago I added sumps to my fuel tanks and took the fuel from the bottom of the tank - or did an internal pump in tank.

[vstol]

Thanks Greg