1985 inline 6 merc 115 fuel pump question

[webster101]

I have been told that a bad lower crankshaft seal or somthing in lower unit will cause low fuel pump press any imput on this would be helpfull and if so any way to diagnos this?

 

[Yepblaze]

Re: 1985 inline 6 merc 115 fuel pump question

Not the lower unit.<br /><br />I suppose that if crankase sealing were an issue it might effect the fuel pumps ability to function well, but not usualy an issue.<br /><br />If you are having fuel starvation issues, it's time to go back through the fuel pump(s)(don't forget new check valves), and pull all the carbs and clean all passageways, filter, jets, with aerosol spray, gentle probing, and compressed air.<br /><br />There are other maladays that can cause problems that might be thought to be fuel related when in fact something else. Like poor compression, or marginal ignition components.<br /><br />Fuel pump kits, and a can of carb cleaner are cheap. A compression tester doesn't cost too much.

 

[andy6374]

Re: 1985 inline 6 merc 115 fuel pump question

If you are gonna go through all the work of taking the carbs off and clean them...You should get the carb cleaner you can buy by the gallon and soak those bad boys (~3-5 minutes), literally soak all metal parts in the cleaner. Dry with compressed air. Then reassemble with new gaskets.<br /><br />Sure fire way to clean the carbs throuoghly.<br />-andy

 

[Clams Canino]

Re: 1985 inline 6 merc 115 fuel pump question

I'm more for using the little red hose of carb cleaner and pressure cleaning all orifices with it.<br /><br />-W

 

[Yepblaze]

Re: 1985 inline 6 merc 115 fuel pump question

Although I have a can of Berrymans Chem dip out in the garage I seldom use it.<br /><br />It has the "STINK" that never leaves, it seems to permiate every thing it comes near. Drag that odor in the house, or spill some on the garage floor and oh boy, you'll hear about that.<br /><br />I'm not one for removing all the welch plugs and every possible piece of plastic or phenolic. Unless absolutely sure something is still in a passageway. Then maybe I'll break it out.