Fuel leaking - Mercruiser quick disconnect fuel rail fitting

[LargeOrangeFont]

I’ve got fuel dribbling from this fuel line where it goes into what looks like a fuel rail quick disconnect adapter. It is leaking from the brass fitting where it connects to the silver fitting.

Is this rebuildable once disconnected? Or do I need a new fuel line?

Engine is 2004 6.2 MX. I tried a different prop to no avail.

@Shlbyntro any pro tips?

 

[F.U.IRS]

Is that a zip tie ? Looks like some redneck engineering

 

[Runs2rch]

View attachment 1216509

I’ve got fuel dribbling from this fuel line where it goes into what looks like a fuel rail quick disconnect adapter. It is leaking from the brass fitting where it connects to the silver fitting.

Is this rebuildable once disconnected? Or do I need a new fuel line?

Engine is 2004 6.2 MX. I tried a different prop to no avail.

@Shlbyntro any pro tips?

Disconnect it. Should be o rings in the rail side iirr?

 

[LargeOrangeFont]

Is that a zip tie ? Looks like some redneck engineering

Yes. It leaked less when held in place

 

[LargeOrangeFont]

Disconnect it. Should be o rings in the rail side iirr?

I’m hoping so. I haven’t looked at an exploded diagram yet. Trying to find it for my model this morning.

 

[Runs2rch]

I’m hoping so. I haven’t looked at an exploded diagram yet. Trying to find it for my model this morning.

2005 or so 6.2 right?

 

[LargeOrangeFont]

2005 or so 6.2 right?

Yes 0w059999 and under.

I don’t see the line or fitting in the Mercruiser catalog on their website.

There is a fuel rail plug on the intake manifold and fuel rail page, and the fuel pump page references bulk fuel line from the regulator to the intake manifold.

 

[Runs2rch]

Yes 0w059999 and under.

I don’t see the line or fitting in the Mercruiser catalog on their website.

There is a fuel rail plug on the intake manifold and fuel rail page, and the fuel pump page references bulk fuel line from the regulator to the intake manifold.

CP Performance - Fuel Supply Module and Rail

Fuel Supply Module and Rail

www.cpperformance.com

#4 and 5?

 

[LargeOrangeFont]

CP Performance - Fuel Supply Module and Rail

Fuel Supply Module and Rail

www.cpperformance.com

#4 and 5?

That’s the new Mercruiser 6.2, not the older GM based one.

 

[Runs2rch]

That’s the new Mercruiser 6.2, not the older GM based one.

New one shows listed as 6.2 350?

 

[LargeOrangeFont]

New one shows listed as 6.2 350?

They make it in a 300 and 350.

 

[Runs2rch]

Disconnect it and report back.

 

[LargeOrangeFont]

This is what I have. It is listed under 350 MPI on the CP website

 

[LargeOrangeFont]

Disconnect it and report back.

Well I don’t have my fuel line quick disconnect tools here at the house. The fuel filter and pump is on the other side of the engine, so I don’t know if this line terminates into something or is just one piece under the motor to the pump.

I’ll be able to see when I take the dog house out to do my annual service next week. Hoping to figure this out and just bring the parts to fix.

 

[Fun Times]

Yes 0w059999 and under.

I don’t see the line or fitting in the Mercruiser catalog on their website.

There is a fuel rail plug on the intake manifold and fuel rail page, and the fuel pump page references bulk fuel line from the regulator to the intake manifold.

Fuel Pump and Fuel Cooler

Fuel Pump and Fuel Cooler

www.mercruiserparts.com

Believe you'll need a fuel line quick disconnect tool... I want to say 3/8th in size.... Local auto parts stores do sell the tools sort of cheap.

24

8M0122042

HOSE ASSEMBLY, Fuel Cooler to Fuel Rail

864513

SS/ACT

$123.33

$116.15

1

8M0122042 Fuel Line - Mercury Marine | Crowley Marine

Find Fuel Line - 8M0122042 here. Offering discount prices on OEM Mercury Marine parts for over 50 years.

www.crowleymarine.com

 

[F.U.IRS]

On the 496 it goes around to the fuel filter/ pump module

 

[LargeOrangeFont]

On the 496 it goes around to the fuel filter/ pump module

This must as well.

 

[LargeOrangeFont]

Fuel Pump and Fuel Cooler

Fuel Pump and Fuel Cooler

www.mercruiserparts.com

Believe you'll need a fuel line quick disconnect tool... I want to say 3/8th in size.... Local auto parts stores do sell the tools sort of cheap.

24

8M0122042

HOSE ASSEMBLY, Fuel Cooler to Fuel Rail

864513

SS/ACT

$123.33

$116.15

1

8M0122042 Fuel Line - Mercury Marine | Crowley Marine

Find Fuel Line - 8M0122042 here. Offering discount prices on OEM Mercury Marine parts for over 50 years.

www.crowleymarine.com

Thank you!

Yes indeed, a disconnect tool is needed. Appears to be 3/8” but I have 5/16” too. I have the tools at home.

Based on that picture is appears that the line may not be rebuildable. Mine is leaking where the steel meets the brass.

That may be a stock photo. I believe my fuel line is longer than the one pictured.

 

[lbhsbz]

Thank you!

Yes indeed, a disconnect tool is needed. Appears to be 3/8” but I have 5/16” too. I have the tools at home.

Based on that picture is appears that the line may not be rebuildable. Mine is leaking where the steel meets the brass.

That may be a stock photo. I believe my fuel line is longer than the one pictured.

Any auto parts store has those for less than the price of lunch....just go pick up another set.

 

[LargeOrangeFont]

Any auto parts store has those for less than the price of lunch....just go pick up another set.

No need. I don’t have a replacement fuel line in hand.

I’m going to be back in a week or so to service the boat anyway so I can order the part in the meantime when I can verify the part number.

 

[JJ McClure]

Why would Mercruiser call a 350 a 6.2?
Are they bad at math or the metric system?
Probably just an o ring lof

 

[lbhsbz]

Why would Mercruiser call a 350 a 6.2?
Are they bad at math or the metric system?
Probably just an o ring lof

HP rating rather than displacement

 

[JJ McClure]

HP rating rather than displacement

Ok. So the 6.2 makes only 350 horsepower?

 

[LargeOrangeFont]

Why would Mercruiser call a 350 a 6.2?
Are they bad at math or the metric system?
Probably just an o ring lof

Mercruiser does not. On their website it is referenced as a 377/6.2. CP seems to have their diagrams merged or otherwise incorrect.

The 377 engine externally is identical to the 350 of the same year. So the hose in question would (should?) be the same for both. I don’t see how the fitting on the end of the hose comes apart but agreed it is an O ring or seal of some sort.

 

[JJ McClure]

Just trying to help... lol

 

[LargeOrangeFont]

HP rating rather than displacement

No it’s cubic inches. The diagrams on the CP website are organized incorrectly.

This is the correct directory

EzPartsWeb Mobile

m-public-mercurymarine.sysonline.com

 

[LargeOrangeFont]

Ok. So the 6.2 makes only 350 horsepower?

It makes 320 actually. The 350 makes 300 HP

 

[JJ McClure]

But it’s odd. A 6.2 is 377. LS based. A 5.7 is a 350. Probably Vortec based. How could they look the same? Did GM ever make a 5.7 LS engine?

 

[LargeOrangeFont]

Just trying to help... lol

Appreciate it. I dont know why this fuel line has a fitting into an adapter fitting to fit the fuel rail.

 

[JJ McClure]

GM junk. Pain in the ass

 

[LargeOrangeFont]

But it’s odd. A 6.2 is 377. LS based. A 5.7 is a 350. Probably Vortec based. How could they look the same? Did GM ever make a 5.7 LS engine?

This is not LS based. It is SBC based. Think 383 without the .030” overbore.

Yes it is all Vortec SBC stuff.

 

[JJ McClure]

That clears up my confusion. That finally makes sense. Guess it’s time to make a new cocktail.

 

[LargeOrangeFont]

GM junk. Pain in the ass

This is the Mercruiser junk actually the GM junk just has the quick disconnect to the line.

I mean it’s 20 years old, so not the end of the world as long as the engine does not need to come out to replace the fuel supply line .

 

[Shlbyntro]

View attachment 1216509

I’ve got fuel dribbling from this fuel line where it goes into what looks like a fuel rail quick disconnect adapter. It is leaking from the brass fitting where it connects to the silver fitting.

Is this rebuildable once disconnected? Or do I need a new fuel line?

Engine is 2004 6.2 MX. I tried a different prop to no avail.

@Shlbyntro any pro tips?

you need a new fuel line. its merc specific. dont forgrt the special disconnect tools, the plastic ones work better than the metal ones

 

[JJ McClure]

Sounds to me like you’ll get it sorted out.

 

[LargeOrangeFont]

you need a new fuel line. its merc specific. dont forgrt the special disconnect tools, the plastic ones work better than the metal ones

Thank you sir. Do you know or could you look up what the line part number is specifically?

 

[Shlbyntro]

with your engine SN

 

[LargeOrangeFont]

with your engine SN

0w021067

 

[Shlbyntro]

part class: 32

original pn: 864513
current pn: 8M0122042

 

[Fun Times]

0W021067 shows your engine to be an MERCRUISER 6.2L BRAVO MPI model number 4R42027RS.

Item number 24 in the following link is your fuel hose assembly.

Fuel Pump and Fuel Cooler

Fuel Pump and Fuel Cooler

www.mercruiserparts.com

1998 Stern Drive 6.2L [BRAVO MPI] [4R42027RS] - Parts Lookup | Crowley Marine

View parts diagrams and shop online for 4R42027RS : 1998 Stern Drive 6.2L [BRAVO MPI]. Offering discount prices on OEM parts for over 50 years. FAST $4.95 shipping available.

www.crowleymarine.com

Mercruiser (5.0l Mpi 350 Mag Mpi Mx 6.2l Mpi Sterndrive) Engine Components

www.marineengine.com

 

[lf2]

But it’s odd. A 6.2 is 377. LS based. A 5.7 is a 350. Probably Vortec based. How could they look the same? Did GM ever make a 5.7 LS engine?

Ls1 and ls6’s are 5.7L.

 

[ElAzul]

Super dangerous scenario I'd Park the boat and take the Speed car for a rip

 

[Orange Juice]

View attachment 1216509

I’ve got fuel dribbling from this fuel line where it goes into what looks like a fuel rail quick disconnect adapter. It is leaking from the brass fitting where it connects to the silver fitting.

Is this rebuildable once disconnected? Or do I need a new fuel line?

Engine is 2004 6.2 MX. I tried a different prop to no avail.

@Shlbyntro any pro tips?

Replace with AN fittings, and steel braided (or similar) line.

 

[OCMerrill]

This is not LS based. It is SBC based. Think 383 without the .030” overbore.

Yes it is all Vortec SBC stuff.

Thats a good engine. Ultra reliable. I cant say much about all the Mercury shit attached to it. Most the time they nail it but when they fail they stick their head in the sand.

Mercury F'd us over pretty good marinizing 5.9 Cummins engines.

 

[Mandelon]

1. I'd try a second zip tie first.

2. Really you guys? No one? Here: Have you tried a different prop?

Carry on, my work is done here.

 

[Badchoices03]

1. I'd try a second zip tie first.

2. Really you guys? No one? Here: Have you tried a different prop?

Carry on, my work is done here.

It's in his very first post, he already tried a different prop and it didnt fix the problem...lol

 

[Shlbyntro]

Replace with AN fittings, and steel braided (or similar) line.

Seeing as how 1 end is the fuel rail itself and the other is direct to the fuel cooler, that aint happening unless he wants to replace his intake and redo his entire fuel system head to stern.

 

[LargeOrangeFont]

part class: 32

original pn: 864513
current pn: 8M0122042

Thank you.
PM your PayPal or Venmo so I can send you some cash for your time.

 

[DarkHorseRacing]

Replace with AN fittings, and steel braided (or similar) line.

I don’t believe the steel braided hose is coast guard approved. Even TCM quit using them.

 

[LargeOrangeFont]

Replace with AN fittings, and steel braided (or similar) line.

The new line is $105… that is actually cheaper than what I’d build out of AN line, fittings, plus the GM fuel rail adaptor.