Replacement fuel pump ? 92 OMC 5.8 Cobra

[Girl-Trapped]

Hello, fellow enthusiasts!

Been lurking for a month or so and wanted to run my first real question up the forum flagpole--I'm replacing the original fuel pump on a 1992 Four Winns 200 Candia with the carbureted OMC Cobra 5.8L engine. In my short boating experience, I've learned that you shouldn't replace marine parts with regular auto parts, and also how the replacement parts bin for OMC engines is steadily getting smaller since they are no longer being made. In researching a new fuel pump, it appears the primary difference between the marine-spec fuel pump and a replacement Holley 12-289-11 fuel pump for the Ford 351 engine is the lack of bypass line. However, they seem to be physically identical otherwise, and I have removed, cleaned up, and installed the bypass line barb from the old pump into the new fuel pump.

So before I install this, can anyone verify that adding the bypass line to the existing vent hole on the new fuel pump satisfies the marine requirement and is therefore safe to use? I linked a picture of both pumps, so hopefully they'll show up somewhere. Thanks!

 

[Scott Danforth]

the original marine fuel pump is a Carter, and is available at Summit Racing for about $50.

the pump you have shown on the right is a marine pump.

 

[Girl-Trapped]

The one pictured on the right is a Holley 12-289-11 pump that I added the bypass barb from the pump that died. Summit Racing shows the Carter marine pump for a Ford 351, but it won't get shipped until next month and they had the Holley carb in stock that I could take home. Attached is the Carter pump.

 

[Scott Danforth]

you cant simply add a bypass to an auto pump. there are additional differences in the internal venting to prevent any fuel leaks from exiting the engine. the fuel leaks are intended to fill the engine to the point the engine runs bad and dies

auto fuel pumps are designed to leak the fuel to the outside

using auto parts on a marine fuel system is a recipe for an explosion