Sorry, Chris1956. I was using a cell phone and failed to see question / concern #4. I plan on using a tach safety sensor to shut the fuel pump off of the engine fails. Yes, that does not eliminate the issue if a fuel leak developes.
1) Corectiin - Fuel manifold (X2) supplying two carbs rack.
2) Return keep fuel cool and reduces chance of 'vapor lock' Fuel return also returns any 'bubbles' in fuel back to tank.
3) The outboard is decades old and the fuel pump has already failed along with having VST issues.
More???
To avoid the high cost and desperate searching for used parts, I've successfully replaced the Vapor Separator Tank (VST), Choke / Primer, and Fuel Pump on my 1998 Johnson 115 Fast Strike outboard. It has been tested and performs without flaw. The design was approached to have less-costly...
The combination of numbers and letters you provided—393778, 140 MX, and 23 D J—refers to a few different components and identifying features of a classic Johnson outboard motor from the mid-1980s.
393778: This is an OEM part number (also written as 0393778) for a V4 lower carburetor assembly...
I had originally planned on adding a 1/4" in-line pressure reducer with a 0.50" to 0.625" orifice but decided to go with a locking needle valve that I may adjust the flow, which in turn adjusts the PSI on the carbs. Fingers crossed. I'm going to try this set up. ;)
saltchuckmatt - It is a standard 115 outboard. Not a VRO.
Chris1956 - Yes, the VST is simple and causing me issues. I did replace the cover gasket and filter, as well as ensuring all the hoses feeding it had a good seal. I agree with the electric fuel pump leading to problems. Unfortunately...
Can this system be successfully done by adding a 4 - 7PSI electric fuel pump, heat protective hose sleeve to fuel lines, and a Wix 33041 fuel filter with restricted bypass returning to tank? If yes, is anyone able to help me identify the purpose of all the hoses attached to the VST? I have no...
