Merc dead-end (no return) EFI & Ethanol

[Knot 4 Me]

My 2004 boat is sporting a 2003 motor. Makes me wonder what my rails look like...

 

[Airpacker]

Did you mean second up above? Not being a smartass, just checking. Sounds like a pretty good work-around from having to run return lines to the tank tho.

Ya, that was a high speed typing incident

I did mean second inlet.

 

[MERPerformance]

Had a guy, that owns a injector cleaning business come by. Show me his card, said; business is picking up. He stated it take about 90 days for the fuel to seperate. I guess we empty our tanks now instead of topping them off.

 

[BUIZILLA]

I also own an injector business, for the last 29 years actually... we started doing gas injectors back in 1994, and have done well over 8,000 since.... this past year and right now we service about 120 a week just on gas injectors, not including diesel injectors... this ethanol fuel is a REAL problem, you wouldn't believe how many outboard powerheads have been victims... cleaning and reclamation rate is about 95% or better right now... you don't know what expensive is until you lose all 6 HPDI Yammi's due to alky crap...

 

[MERPerformance]

I also own an injector business, for the last 29 years actually... we started doing gas injectors back in 1994, and have done well over 8,000 since.... this past year and right now we service about 120 a week just on gas injectors, not including diesel injectors... this ethanol fuel is a REAL problem, you wouldn't believe how many outboard powerheads have been victims... cleaning and reclamation rate is about 95% or better right now... you don't know what expensive is until you lose all 6 HPDI Yammi's due to alky crap...

Send me a card. Guy's that come into my shop saying they just started a injector cleaning business, make me nervous about what they don't know about injectors. Do you sell injectors? Mark

 

[Pismo10]

In the auto side of things, we started seeing this when chrysler introduced returnless efi to the world. Tons of miss firing v6 and v8 mopars due to fugged injectors. Wosrt is always beside the end of the rail.

Easy fix on mercs is to un cap the rail and connect it to the sedon inlet of the seperator housing but, you need to put a pressure reg in between to keep the rails pressurized.

You can do this on the older 454 and 502 Mags as well. It helps solve the vapor lock problems as well. To the tank is best but the fuel sep is better than nothing. Need that regulator tho...Set to what PSI? 43-45? The VST models have a return line back to the VST.