Fuel filter options for Ford 347 with Edelbrock carb

[MarkR]

Looking to finalize the fuel system design and seem to be coming up with a lack of information issue.

Combination is a built Ford 347 motor running an Edelbrock 14703 carb.
Comparable builds have made in the region of 420 BHP without absolute optimization.

Intention is to have either a single combined pressure regulator with filter or separate regulator (Holley 12-803 probably) and in in-line filter.
I'm aiming at 10 micron filtration but anything below 30 micron will likely suffice.

Any suggestions on any combined regulator / filter to use that will guarantee to maintain enough continuous flow to support the 347?
Same query regarding an in-line filter option (deadhead regulator is an easy item to source).

Loads of options out there but most won't give any usable flow figures for filtration.

The Malpassi 85mm bowl type looks the part but will run out of flow under high load / medium revs scenario and cause lean running followed by expensive damage. I've got that T-shirt!

Last resort would be to split the regulator outlet into two inline filters to guarantee sufficient flow.
Not preferred but a safe backup option.

 

[Lee Patterson]

This worked very well for me. 430 hp SBF with a 4150 holley on it. Mechanical fuel pump. No need for a regulator.

3.5 IN high flow AN fuel filter

Discover high-performance AN fittings from Redhorse Performance. Shop durable, precision-engineered Redhorse fittings for racing, street, or custom builds.

www.redhorseperformance.com

 

[Devin]

Mark, I’m also installing a 347 with carb (Holley 650?) & planning on running the Malpassi filter regulator with 10mm fittings and 6AN lines and Facet Red Tops that run 6.5-8psi & 45gph. From what I am finding this combo should support up to 450hp. Am I calculating things wrong or is there experience out there showing that won’t be enough flow? You have me a bit worried now.

 

[Jean-Marc]

This filter may work find for a street use, but if you want to be sure, I suggest to use this kind of filter
https://www.summitracing.com/parts/sum-g1509

 

[Darius Rudis]

AN fuel filter for my 363CID 950cfm Holley.

 

[JP Verweij]

Mark, I’m also installing a 347 with carb (Holley 650?) & planning on running the Malpassi filter regulator with 10mm fittings and 6AN lines and Facet Red Tops that run 6.5-8psi & 45gph. From what I am finding this combo should support up to 450hp. Am I calculating things wrong or is there experience out there showing that won’t be enough flow? You have me a bit worried now.

Be aware, a Facet Red Top does 45gph free flow!, at 4psi just 20 GPH, at 7psi even less!

When calculation don't use free flow numbers, you'll need the flow numbers under pressure needed.
So yess, you'll need 45gph at aprox 7psi fuel pressure.

Also don't get confused by UK gph & US gph as its not the same amount.

For instance, a Holley Red flows 97 US gph free flow, 67 gph @ 5psi

 

[Jean-Marc]

JP I took the data from Merlinmotorsport and I did not mix up US gallon and Imperial gallons, but I do prefer the metric system. https://fr.merlinmotorsport.co.uk/p/pompe-a-essence-electrique-bleue-top-facet-480534e-btp001

 

[JP Verweij]

JP I took the data from Merlinmotorsport and I did not mix up US gallon and Imperial gallons, but I do prefer the metric system. https://fr.merlinmotorsport.co.uk/p/pompe-a-essence-electrique-bleue-top-facet-480534e-btp001

Those are free flow numbers, not the 7psi gph flow numbers.

Facet pumps are also notorious to pump even less after running for a while.
You'r AFR gauge will tell you. Mixture is going lean then.
The plunger design isn't durable also.

You'r better of with a vane pump like the Holley Red.

 

[Howard Jones]

The kind that use a wire screen disk are pretty much useless IMHO. It takes very little to plug it up. You won't want to constantly take it apart and clean it. first one

Pardon Our Interruption

The second kinda uses the same style housing but a better filter. It has a lot more filter area and takes quite a lot of debris to plug it up. ok for tight fit.

Pardon Our Interruption

I like the last type if you have the room. They will last years without getting pluged up unless something unusal happens like dirt in the gas station tank or something.

Pardon Our Interruption

40 microns is probably fine for carbs. I would use 10 micron filters on FI systems. Nothing less that AN-6 size hoses and AN-8 above 400 HP, The filter will need to have the same size in/out as the pump and regulator you are using as well as the hose size.