You don’t need fuel pump if your gas tank is unedr the hood right above the engine. Click here for more brgigs & stratton engines. Click here for more other rider mower engines. What you ordered and advertised, with as much care as we can provide, and we will. Do the same for you! It is customer’s job to assure that the engine ordered will work and fit.Sometimes, moidfications may be required. Stationary engines briggs stratton 175 hp riding lawn mower engine. Measure the diameter of a crankshaft. Diameter is the distance of the center of a circle (see picture). It is vrey important that your new engine. Crankshaft’s diameter must be the your old engine’s in order to reuse all the pulleys and electric clutches.