How many fuel filters are really necessary? I'm installing a new gas tank and sending unit tomorrow, and I'm wondering if I should put a filter in the rubber hose that connects the sending unit tube to the hard fuel line since I already have an Edelbrock inline filter between the pump and the carb. My main concern is not creating another fuel-flow restriction if it's not necessary. I'll be feeding a thirsty Pro-Systems HP double pumper carb on my 383 (~450HP street motor) with the stock 3/8" lines and an Edelbrock Performer mech. fuel pump so I don't want to restrict the flow if it all possible. Is the inline filter between the pump & carb enough, or should I really have another before the pump to keep any crap out of the pump (or does the sock on the sending unit take care of this)? If a second filter is necessary, any suggestions?

With a mic. pump you don't realy need a filter before the pump. The inline filter should be fine.

With a mic. pump you don't realy need a filter before the pump. The inline filter should be fine.


I agree with this. A mechanical pump system needs just the filter between the pump and carb. Take the filters out of the float bowls on a Holley too!

I'd leave them in just for insurance sake.

I'd run dual filters for a couple of tanks of fuel to catch the majority of the inevitibly losened junk. Be sure to run the first couple tanks down to fumes..... Then remove the first inline filter, a single filter between the mech pump and carb now should suffice nicely, provided you trust your fuel supplier. I like plastic or non-metalic fuel filters to prevent the posibility of boiling the fuel in the a metal filter housing and vapor lock.

I'd run dual filters for a couple of tanks of fuel to catch the majority of the inevitibly losened junk. Be sure to run the first couple tanks down to fumes..... Then remove the first inline filter, a single filter between the mech pump and carb now should suffice nicely, provided you trust your fuel supplier. I like plastic or non-metalic fuel filters to prevent the posibility of boiling the fuel in the a metal filter housing and vapor lock.
Thats a great idea. Let the back filter catch the crap then toss it.

I'd run dual filters for a couple of tanks of fuel to catch the majority of the inevitibly losened junk...

Sounds like a good idea, but should I really expect to have much junk since I'm installing a brand new tank and sending unit? I plan to put some fuel in the tank, slosh it around, and dump it before I install it to clean out any debris that may be in there. I'm also planning to blow out the fuel line from one end to the other to clean it out too.

You're starting with a tank that is new, clean, and rust-free- just like from the factory. Most of the factory stuff went a whole lifetime with nothing more than the crappy little filter on the carb. How much gook are you expecting in there?

The mic pump uses a diaphram. Any fillings that you miss could damage it. Its a lot cheaper to put a cheap inline filter in for the first few tankfulls when you didn't need it than replacing the pump because you did.

I don't know what you guys think but I cut the sock off the sending unit in the tank. I only use the external filters because I don't want to have to drop the tank if the fine mesh sock gets plugged.