Have a leak on left pipe outlet at the fuel injection pump. 99% sure its not the pipe connection but under the flange that pipe connects to. There's 3 oval oblong flanges that appear to be what each pipe fastens to. They each have a bolt at top and bottom. The bolts are 5 sided and would require some special wrench. Any chance just tightening the bolts will solve problem? Is there a o ring or gasket under each flange? Thanks