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Author Topic:   Pressure Gauge Leak

DLee posted 03-25-2014 10:11 PM ET (US)
I started up the boat yesterday when the thermometer hit a balmy 28˚F somewhere around mid afternoon and she ran great. While running I noticed a few thin streams of water flying up from a tiny hose that followed the fuel and throttle cables down into the hull. Looking at the dash board I noticed the Pressure gauge was dead and figured the tiny hose carrying water was probably related to the gauge.
The hose seems to be fine once inside the hull of the boat so I'm guessing the leaks are from weather deterioration. Is it possible to just replace the worn section of exterior tubing with some sort of connector between the old and new? Or will this 'shunted connecton' change the pressure readings and require changing the entire line?
What is this pressure gauge telling me anyway? Do I need it?
This is all on a 2003 Montauk 170 with a Mercury Saltwater 90 2 stroke.
Thanks,
Dennis
saumon posted 03-26-2014 12:04 AM ET (US)
Yes, it can be repaired. If you can pinpoint the hole(s), a better way than replacing would be to cover the hole(s) with the appropriate size adhesive-lined shrink tubing, but to slide the tubing over the hose you'll have to disconnect it from the barbed fitting (usually just above the top cylinder).
That gauge is telling you the water pressure running into the powerhead and is probably the single most important one to have, even more than a engine cylinder head temperature gauge. When you put in a new water pump impeller, make a mental note of the water pressure at WOT (likely in the 12 to 15-PSI range), and when it will start to drop over time it will mean you impeller is going south.
DLee posted 04-02-2014 10:28 PM ET (US)
Saumen, thank you so much. I'll try the shrink wrap option first. What are the chances my marine supply will have such an item…? I'll search around.
So, in terms of pressure, just seeing the healthy squirt from the engine cover is not necessarily enough? I'll make some notes when I get this squared away.
Thanks again.
Dennis
DLee posted 04-02-2014 10:29 PM ET (US)
Sorry for the typo above Saumon.
d
saumon posted 04-02-2014 10:59 PM ET (US)
No problem, everybody got it wrong ("saumon" is the french for "salmon", pronunciation: /somɔ̃/).
The adhesive-lined shrink tubing can be found in any hardware store in the electrical section. If there's visible holes, I'd first put a wrap of black electrical tape over them first and before the shrink tubing so the glue won't enter the hose.

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Author	Topic: Pressure Gauge Leak
DLee	posted 03-25-2014 10:11 PM ET (US) I started up the boat yesterday when the thermometer hit a balmy 28˚F somewhere around mid afternoon and she ran great. While running I noticed a few thin streams of water flying up from a tiny hose that followed the fuel and throttle cables down into the hull. Looking at the dash board I noticed the Pressure gauge was dead and figured the tiny hose carrying water was probably related to the gauge. The hose seems to be fine once inside the hull of the boat so I'm guessing the leaks are from weather deterioration. Is it possible to just replace the worn section of exterior tubing with some sort of connector between the old and new? Or will this 'shunted connecton' change the pressure readings and require changing the entire line? What is this pressure gauge telling me anyway? Do I need it? This is all on a 2003 Montauk 170 with a Mercury Saltwater 90 2 stroke. Thanks, Dennis
saumon	posted 03-26-2014 12:04 AM ET (US) Yes, it can be repaired. If you can pinpoint the hole(s), a better way than replacing would be to cover the hole(s) with the appropriate size adhesive-lined shrink tubing, but to slide the tubing over the hose you'll have to disconnect it from the barbed fitting (usually just above the top cylinder). That gauge is telling you the water pressure running into the powerhead and is probably the single most important one to have, even more than a engine cylinder head temperature gauge. When you put in a new water pump impeller, make a mental note of the water pressure at WOT (likely in the 12 to 15-PSI range), and when it will start to drop over time it will mean you impeller is going south.
DLee	posted 04-02-2014 10:28 PM ET (US) Saumen, thank you so much. I'll try the shrink wrap option first. What are the chances my marine supply will have such an item…? I'll search around. So, in terms of pressure, just seeing the healthy squirt from the engine cover is not necessarily enough? I'll make some notes when I get this squared away. Thanks again. Dennis
DLee	posted 04-02-2014 10:29 PM ET (US) Sorry for the typo above Saumon. d
saumon	posted 04-02-2014 10:59 PM ET (US) No problem, everybody got it wrong ("saumon" is the french for "salmon", pronunciation: /somɔ̃/). The adhesive-lined shrink tubing can be found in any hardware store in the electrical section. If there's visible holes, I'd first put a wrap of black electrical tape over them first and before the shrink tubing so the glue won't enter the hose.