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Author Topic: Working on fuel line on M-25XP  (Read 189 times)

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ChrisW

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Working on fuel line on M-25XP
« on: April 06, 2019, 12:21:45 PM »

I need to replace a hose in the fuel line of my Universal M-25XP.  The hose I am replacing is in the fuel return line right where it is connected to the injectors. It's a small hose about 3 1/2 inches long. From the manual, it looks like the connector between this small hose and the larger one should be mounted in a bracket.  Mine is not mounted in that bracket and I am not exactly sure how it is supposed to be mounted. Is there anything that I should be aware of before I start?

I figure I should close the valve to the fuel line at the tank. I thought it might also be a good idea to run the engine afterwards until it stops to reduce the amount of fuel in the line.  Is that a good idea?  And is it necessary to do before removing the old fuel line hose?  I ask that because I don't have the starter hooked up right now.

Also, I understand that I will need to bleed the fuel system afterwards.  From the instructions in the manual there are two places that I need to bleed. I located the one on the injector pump, but am unsure about the one on the fuel filter.  When they mention the fuel filter, does that refer to the Racor filter that is seperate from the engine?  Because I do not see anything that looks like a bleed valve where the engine diagram indicates the fuel filter should be.
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Noah

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Re: Working on fuel line on M-25XP
« Reply #1 on: April 06, 2019, 12:40:54 PM »

Can you post a picture, please?
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KWKloeber

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Re: Working on fuel line on M-25XP
« Reply #2 on: April 06, 2019, 01:18:25 PM »

Chris

OEM thereís a bracket between the injection hose and the return hose. Itís just a means to mount an adapter and to keep tension off the hose barb connections. See pic 1. Not absolutely necessary as long as you have the return hose zip tied or held so that it doesnít pull on the fittings.  Think ďwire terminals.Ē

Just pinch off the return hose (yíallís tank is higher than the engine correct?) You might get some dribbles to catch. Nothing serious. Itís on the other side of the injection pump so no fuel flow unless the pump (i.e., engine) is operating, and on the return so no need to bleed anything afterward.

My return comes off the front so thatís where my bracket lives, but you can see the detail on my zoom in pix. My adapter (reducer? increasor?) was crap quality and disintegrated so I fashioned one using male and female thread hose barbs thru the bracket.


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Twenty years from now you'll be more disappointed by the things you didn't do, than by the ones you did.
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Explore.  Dream.  Discover.   -Mark Twain

ChrisW

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Re: Working on fuel line on M-25XP
« Reply #3 on: April 06, 2019, 02:54:02 PM »

I hope this photo went through.
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ChrisW

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Re: Working on fuel line on M-25XP
« Reply #4 on: April 06, 2019, 03:01:48 PM »

Chris

OEM thereís a bracket between the injection hose and the return hose. Itís just a means to mount an adapter and to keep tension off the hose barb connections. See pic 1. Not absolutely necessary as long as you have the return hose zip tied or held so that it doesnít pull on the fittings.  Think ďwire terminals.Ē

Just pinch off the return hose (yíallís tank is higher than the engine correct?) You might get some dribbles to catch. Nothing serious. Itís on the other side of the injection pump so no fuel flow unless the pump (i.e., engine) is operating, and on the return so no need to bleed anything afterward.

My return comes off the front so thatís where my bracket lives, but you can see the detail on my zoom in pix. My adapter (reducer? increasor?) was crap quality and disintegrated so I fashioned one using male and female thread hose barbs thru the bracket.

OK that's good to know.  The fuel tank is indeed higher than the engine. What should I pinch the hose off with? A Vise Grip maybe? I don't want to damage it.
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KWKloeber

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Re: Working on fuel line on M-25XP
« Reply #5 on: April 06, 2019, 03:13:09 PM »

Thereís your bracket. The original crap adapter the universal used is gone.

Sure vice grip will work. They actually make one for pinching off hoses.
Itís rubber man you arenít clamping onto a frozen bolt, just gently close it off.
Of, letís see, I could ....... :donno: .....around the hose to protect it?
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Twenty years from now you'll be more disappointed by the things you didn't do, than by the ones you did.
So throw off the bowlines.  Sail away from the safe harbor.  Catch the tradewinds in your sails.
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ChrisW

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Re: Working on fuel line on M-25XP
« Reply #6 on: April 07, 2019, 11:29:21 AM »

Just want to say thanks.  Hose has been replaced.  I had about a coffee can's worth of fuel come out before I grabbed a better vise to pinch off with. 
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Ron Hill

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Re: Working on fuel line on M-25XP
« Reply #7 on: April 07, 2019, 12:34:22 PM »

Guys : I use a needle nose vice grips. 
I slid a short piece of hose over each grip and use it to "clamp" off a fuel line!!  Works just fine!

A thought
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Noah

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Re: Working on fuel line on M-25XP
« Reply #8 on: April 07, 2019, 02:33:32 PM »

My XP fuel return line at the injectors looks a bit different. It uses a small diameter braided fuel line/hose about 7 in. long connected to my bleed thumbscrew valveóif I have this understood correctly?
« Last Edit: April 07, 2019, 02:35:27 PM by Noah »
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KWKloeber

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Re: Working on fuel line on M-25XP
« Reply #9 on: April 07, 2019, 02:49:36 PM »

Looking @ the wrong end Noah thatís the XP fuel/air bleed hose TO the #1 injector bango, the return to the tank is FROM the #3 injector bango, per the top pic I posted, dead center of pic.
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Twenty years from now you'll be more disappointed by the things you didn't do, than by the ones you did.
So throw off the bowlines.  Sail away from the safe harbor.  Catch the tradewinds in your sails.
Explore.  Dream.  Discover.   -Mark Twain

Noah

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Re: Working on fuel line on M-25XP
« Reply #10 on: April 07, 2019, 02:54:52 PM »

Got it! Thx, Ken!
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1990 hull #1014, San Diego, CA,  Fin Keel,
Standard Rig
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