The Stovebolt Site Forums The Shop Area Engine Shop 49 Panel truck with the Gas Gone

This problem is getting to be old, the gas in the carburator and inline glass filter drains away about a day or so after used requiring that I prime the carb each time it is started. The engine, a 216, and Rochester W1 carb were both rebuilt. So how do I prevent this? I was thinking of some kind of inline check valve just before the inline glass filter which is just before the carb, or should I be looking elswhere for a solution? OH, the fuel pump was also rebuilt. Thanks much for the help.

God bless,


Dave

I had this problem with my Valiant. What I did was bend the supply line up to put the filter into a sump position. That seems to have solved the problem for me.

I think the fuel pump is supposed to have a check valve in it. I had the same problem and replaced my Rochester B carb with a Carter, and bought a new fuel pump. That seemed to fix it.

Kurt

the fuel pump is comprised of 2 check valves, with a diaphram in between, and the fuel evaporates it doesn't drain back, as the needle valve (inlet to the carb) comes in near the top, unless you put a dip tube of some sort in the carburetor it can't siphon it back out. If your filter is draining, there is either some little pieces of stuff in the fuel pump or the valves are faulty. Mine does the same thing if it sits for more than a week or so in the summer, but once I took out the little pieces of gunk in the pump the filter stays full (this has happened a couple of times) By the way is your garage heated? That might explain how it evaporates so quickly.

Replace your fuel pump. I've had this on my cars and rebuilt one of my fuel pumps myself, now I just go to NAPA and buy a new one.

I notice that the fuel level in the glass filter bowl drops about half way down in a day or so, and the carb bowl apprently dries up. As mentioned, I rebuilt the pump when I restored the truck. Where would I look for the partical, is there a place where they typically collect? As to getting a new pump from NAPA, perhaps, but this is the glass bowl type and I like it in that it the one is supposed to have, do they have that type? Apparently there is no check valve that can be installed in line before the barb filter? Any thoughts?


God bless,


Dave

yes they get stuck in the valves of the pump, which consists of 2 check valves in series. there would be no reason to put a check valve before the filter, there is already 2 of them in your fuel pump. Apparently you didn't do a complete rebuild of your pump, as you would have replaced the 2 valves in said pump. There is a suction valve which is a one way valve,(check valve) which allows the fuel to flow into the diaphragm chamber, the discharge valve which is also a one way valve which stays closed on the inlet portion of the pump action because it is a check valve, and only allows flow one way. Then on the discharge portion of the pump action the discharge valve opens allowing fuel to go out of the pump. and the suction valve closes because it is also a one way valve. I hope this explains the operation of the fuel pump. You can use the glass portion on a new fuel pump, you just have to swap that part with the top of the new one. Thats how I got my cool glass fuel pump filter installed. As MY clear filter drained out in about 2 minutes. I have to put gas down the carb nearly every time I start my truck, have done it for years. I guess I could just crank it till it got fuel, but this is easy on me and easy on the starter.

Thank you, I used a complete rebuild kit on the fuel pump when I overhauled it, so I must have replaced the check valves. I saw some OEM replacement fuel pumps at NAPA,one in particular was the dual action, both pump and vacum, what do you think of that one, and can the glass bowl be put on that as well? Again, I appreciate your help.

God bless,

Dave