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This gasket will not work on a high volume(double stack, alky) fuel pump stack. The Tillotson Fuel Pump Gasket goes below the fuel pump diaphragm. If your gasket is above the diaphragm, this will cause tuning problems and hurt your carburetor's performance.
There are two different sized fuel pump gaskets for the Tillotson Carburetor. The stock gasket is .020" thick and is usually specified by many rulebooks. There is a thicker .040" gasket that allows more fuel to be pumped through the carburetor that gives more freedom and opportunity for better carburetor tuning and performance. Check your rules before ordering.
Fits HL-1A, HL-129E,HL-132H,HL-166B&C,HL-189F,HL-227A,E,HL-229A,HL-321E,HL-232A,E, HL-250A,B,C,D,E, HL-274E,HL-,292G,HL-293A,F,HL-299E,,HL-334A,AA,B,AB,WX,WXA,WXG,HL-357A,B HL-360A,HL-383A,HL-384A&B, HL-385A, HL-388A,HL-395A