Hi folks,
I have a 1967 442 with the 400ci in it. New gas tank (including interior filter sock), and new fuel lines (hard and soft) were added during 2016 restoration. I have followed the intake fuel line from tank to fuel pump, and fuel pump to carb and there is no inline filter. My carb is a 750 cfm Holley Street Demon that has a sintered bronze filter inside the carb that can be removed and cleaned or replaced. My car also has a mechanical fuel pump.

My questions are, if it were your car, would you add an inline filter, and if so, before or after the mechanical fuel pump, and to what micron filtration size (100 microns, 30 microns, etc.). If I decide to add one, I don’t want to starve the carb of fuel and overwork my fuel pump. Motor is putting out around 400hp with larger cam, Edlebrock intake, head work, full tube headers, and 3 inch exhaust with crossover.

 

I would add a standard 1 piece plastic or metal inline filter. You can put it before or after the pump, this way you don't have to constantly clean the sintered filters in the carb.

 

oldcutlass - Thanks for your advice, much appreciated!

 

I like to add an inline filter before the pump to keep the crap out of the pump valves.

 

Joe - Thanks, good reasoning, much appreciated! I have more soft line to work with on that side of the pump anyway, so that will make it easier.

 

Anyone have a picture of their before pump in line filter install. And does it matter what brand or size etc for stock 350 ?

 

Redbud40 - I purchased an "Earls" brand, aluminum cased, with the sintered bronze internal 30 micron filter from Summit to install before my mechanical fuel pump. I haven't installed it yet because my car is already put up for the winter. I intend to install it the first thing in the spring. I have plenty of 3/8" flexible fuel line before my pump so it should be a simple install. I'm sure there are many good brands out there, my only advice would be to steer away from the cheap, see through plastic or glass filters, I've read too many posts about them leaking.

 

The install is pretty self explanatory. You need to pinch off the rubber line or be very quick in your install or you'll have fuel running up to your armpits and on the floor.
Inline filters come in metal or plastic.

 

Another dumb question. Do you keep the paper filter in the carb housing for “ double filtration” or remove and have a hollow cylinder there ? Thanks
Mike

 

I put an A/C Delco steel inline filter back @ the sending unit on my 66 442 3X2 car. I also used the OEM fuel filter with absolutely no issues. There is virtually no resistance using the mentioned filter. You can't see it when it installed in the rear and up high out of sight. I did not mount it,I just put it inline between the rubber hose.

 

An inline filter on the pressure side introduces a potential failure point that could cause gasoline to be pumped on a hot engine. I'm for an inline filter on the suction side of the pump; but, not on the pressure side.

This is another reason in addition to Joe P's about keeping stuff out of the pump.

Good luck!!!

 

Sugarbear - I'm the OP. See my post #7 above. I'm putting my filter before my fuel pump. As a back-up, my Holley Street Demon carb has a finer sintered bronze filter element at the intake into the carb that is not too hard to get to. I just thought an additional filter prior to the fuel pump would add extra protection for my fuel pump, and hopefully lessen the chance of having to pull and clean the filter in the carb.

 

Missed that in #7, was focused on the question in #1.
Good choice going before the pump.

Good luck!!!

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