Background: 1970 3400 200 hours since piston replacement, it has been running fine. Moving logs, got the nose low in a ditch, started to sputter like it was out of gas. Got it to roll back level, put 5 gals of gas in, let it set a minute, started up but would not hold RPM, sputtered and died. Limped it back to the shop, checked for flow out of the carburetor drain, just a trickle. Removed line from shut off valve at tank, check for flow, full pipe nice and steady. Checked flow at inlet to sediment bowel, just a trickle. Because it is easy, I removed the carburetor, inlet filter not plugged, float checked just right at 1". So, am I correct to suspect the fuel pump and its filter? The pump has never been changed, for $40 it might be best to replace it?? Original Holley carb and always heard the Zenith was so much better. There are two listed on this site, one for $220 and one for $404. Are they really that much better?? Any thoughts would be appreciated. Bruce