Re: fuel pump install...?
Suzuki40, I have the manuals for the 71' and 76' 4HP. I looked at both powerheads and I see that both the integrated tank and aux fuel pump are shown. In the integral tank model, there is a pulse hose going from the side of the powerhead to the carb. This pulse hose provides a pulse of pressure to an internal diaphragm inside of the carb to give the fuel some pressure to enter the carb and operate the carb float.<br /><br />The list shows a fuel pump of 389046 can be added to replace the pulse hose. I'm sure you will have to 'cap off' the old pulse line input at the carb. You will need to buy and install the 'fuel connector assembly' (where the external tank hose line will connect to the motor). A length of fuel hose from this fitting will go to the input of the new fuel pump. The output of the new pump will connect to the carb at the same location as your original tank.<br /><br />As you may have gathered, they show 2 lower carb. bodies, one for a built-in tank, the other for an external pump, like you want. <br /><br />Just a word of caution...you just knew it was coming right?? Use new fuel lines thru out the new retrofit along with new clamps. Check any new fuel line routing for points of abrasion and adjust for proper clearances as needed. We sure don't want you to coming back saying the motor suddenly made the 'Whomping Sound' <br /><br />Good luck, and keep us posted on your progress.
