Holley 12-130 In-Tank Retro-Fit Fuel Pump. If I follow the directions, the filter mat will be 2" off the bottom of the tank. It says on a 12" deep tank to cut the pickup hose to 5". That would put the HydraMat 2" off the bottom. Is that correct? How far off the bottom do you want it? What RTV do you use to seal the foam gasket? Thanks!