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Thread: Is there a minimum post-pump filter size (micron) for carburetors?

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    Default Is there a minimum post-pump filter size (micron) for carburetors?

    Is there a minimum size post pump filter for a carburetor?

    I originally had a carb but went to EFI. I changed my old carb filters to the EFI pre (100 micron) and post (10 micron) filters. Holley part numbers 162-551 & 162-552. I'm returning to a carburetor setup, and I'm replacing the fuel pump with a Holley Blue Pump 12-802 & Pressure Regulator 12-841.

    In the instructions for the regulator, it states to use a 40 micron post filter for carbs and lists the 10 micron filter for "High Pressure EFI" systems (Figure 2C, Page 2, document 199R10575).

    Am I OK with the 10 micron filter with the Holley Blue Pump? Or, since I now have a "low pressure" pump, do I need to get part #162-566 to change the 10 micron to a 40 micron filter?
    Last edited by Texasdoc; 04-11-2016 at 11:18 PM.
    2012 LoneStar Classics 1965 427LS Cobra Replica, Navy Blue, Silver Stripes, 408W Stroker, 500HP, 600 Ft/lb, AFR 195 Renegade Heads, RPM Performer Intake, Holley Terminator EFI, Tremec TKO600 5-speed manual transmission, Ford 9-inch Rear End, 3.50:1 Gear Ratio.

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    Quote Originally Posted by Texasdoc View Post
    Am I OK with the 10 micron filter with the Holley Blue Pump? Or, since I now have a "low pressure" pump, do I need to get part #162-566 to change the 10 micron to a 40 micron filter?
    Yes, use the 40 micron carburetor filter after the pump.
    http://documents.holley.com/holleyfu...ems_chart1.pdf (Fuel System Selection Chart)
    http://documents.holley.com/flyer_ho...el_systems.pdf (Holley Fuel Systems Brochure)
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    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, FRPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 tires.

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