Fuel draining back through pump

[69heavychevy]

For the longest time I always ran a fuel filter right before the pump. I did some reading and found that your supposed to run it between the pump and carb.
I did that and noticed that within minutes my filter would be dry, which would make it hard to start.
I read that there's supposed to be a check valve built into the pump to avoid this. I have a lifetime warranty on the mechanical pump, so I switched it out, but I still have the same problem.
The fuel pump is an Oreilly's Precision unit. Did I just happen to get a defective unit, or is this normal?

[truckin 79]

I like to run the larger metal fuel filter and I have put filter right before fuel pump. I can not seem to get the metal line and rubber hose to fit correctly before carb. I do not like the cheapy Q-jet filter that fits inside the carb housing. Although I have read that site plugs do not leak as most people think, I still put epoxy over well plugs when I rebuild a q-jet. I dont see a problem with leaving fuel filter by fuel pump.

[andyh1956]

The fuel pump valves are just check valves. If no filter between tank & pump then if you suck debris into the pump & it gets lodged in a valve then the pump no worky.
If you suspect pump valves leaking try removing the suction line from the pump & put a bucket under it & see what may drain out.
You will have to plug the inlet hose from the tank.

[69heavychevy]

I forgot to mention I have a vacuum secondary Quick Fuel carb that's fairly new if that makes a difference.
The strainer on my sending unit is still in good condition so the fuel getting to my pump is nice and clean. I have also verified this several times since I've drained the lines a few times removing and installing the pump.
So I'll swap out the new pump to see if I got a defective unit.

[69heavychevy]

[QUOTE=truckin 79;8234963]I like to run the larger metal fuel filter and I have put filter right before fuel pump. I can not seem to get the metal line and rubber hose to fit correctly before carb. I do not like the cheapy Q-jet filter that fits inside the carb housing. Although I have read that site plugs do not leak as most people think, I still put epoxy over well plugs when I rebuild a q-jet. I dont see a problem with leaving fuel filter by fuel pump.

I made my own hard lines running from the pump to the carb. When I was running an Edelbrock I had hard line from the pump all the way to the carb. With the Quick Fuel I know have a section of rubber hose between the hard lines so I could run the filter.

[cadillac_al]

There ya go, if you run a metal filter you won't see the fuel draining out any more. I think it is the fuel pump. Mine used to do it but I haven't checked for a while.

[Tom]

I've never encounterd this issue running the filter between carb and pump. Somethings up. Maybe orielly brand doesn't have the check valve for some stupid reason?