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verboatn
#1 Posted : Tuesday, May 31, 2011 8:50:33 AM(UTC)
verboatn

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I have been updating and trying to get running my new (to me) 1977 express's pressure water system. I put in a new Jabsco accumulator tank and a new city water input with pressure regulator. I updated the hoses in the closet where the pump is. The pump works and generates pressure. My problem is when I turn on the tap, pressure is fine, 5 seconds later it slows to a trickle. When I hook up city water and pressurize, the same thing happens.

Does anybody have any ideas what could be causing this?
Verboatn 1977 FB Express
Chrysler 318's w/Carter carbs
new Marinette owner
Docked Anchors Away, Marblehead, OH
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yooper
#2 Posted : Tuesday, May 31, 2011 2:38:30 PM(UTC)
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Might be missing a check valve. You need at least three. One at the water heater cold inlet to keep your toilet from steamin. One right at the city water inlet before the pressure regulator to keep pump water off your deck. One protecting the outlet of the water pump/accumulator. City water can not be allowed to confuse your pumping system, it might start filling the tank. When operating the water pump you want it to pressurize the system. Disconnect the city water and debug the pump system. Then pull the plug on the pump and debug the city system. You will solve it. Always remember, plumbing is simple. All you really need to know is S**T runs downhill and payday is on Friday.
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rv
#4 Posted : Tuesday, May 31, 2011 8:53:46 PM(UTC)
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Unscrew the cap off of the faucet and make sure there is no debris in it ,This will cause this problem.
Bob
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verboatn
#5 Posted : Wednesday, June 01, 2011 12:06:28 PM(UTC)
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RV, I'll check that this Saturday. I don't think there is any screen in the faucet though that would get plugged up
Verboatn 1977 FB Express
Chrysler 318's w/Carter carbs
new Marinette owner
Docked Anchors Away, Marblehead, OH
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GB49
#6 Posted : Wednesday, June 01, 2011 12:46:16 PM(UTC)
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Check valve(s) may be faulty. I replaced on at the shore fill and one at the hot water tank. The spring and or washer in the valve get tired after repeated use. I think they were $5 or something like that. Danbury Hardware has them across from Fort Firelands.

Would also check the faucet strainers as mentioned earlier.

Is the low pressure on both hot and cold??

-Karl
1986, 32' Sedan, twin 360ci, 275hp Chrysler's w/ K&N flame arrestors
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tundrarules
#7 Posted : Wednesday, June 01, 2011 3:02:08 PM(UTC)
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You may have air in the system somewhere. Everytime I run the tank out of water, I must get the air out. Mine has a faucet type valve in the air condition compartment that I open up for a few seconds to get the air out. After air is out she runs great Dancing




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If the guys on this forum take their time to help you, have the courtesy to update your thread with the resolution.
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Docsnow
#8 Posted : Wednesday, June 01, 2011 3:51:21 PM(UTC)
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When U have the municipal water on look at the vent coming out the fresh water tank is there water coming out the vent if so U’ll need a check valve as Yoop suggested plus while on M/W hooked up make sure the water tank pump switch is off also. Put check valve right after the pumps outlet side.On pg.475 of the W/M 2011 catalog there’s a sketch of a typical marine water hook up that my B helpful in your dilemma Anxious
AnyWho just a suggestion argh!! SUCK don't they Eh?

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jralbert
#9 Posted : Wednesday, June 01, 2011 8:50:48 PM(UTC)
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is it not possible to install the check valves backwards, blocking flow as described in the orig post?
Joel Albert, Potomac MD
"Charlie B" - 1988 32' FBS
Twin 318's/FWC/16x15 nibral props
docked Deale, MD
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BCassedy
#10 Posted : Thursday, June 02, 2011 6:49:00 AM(UTC)
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As a former mobile home resident and cistern user, I can attest to Joel's observation. Installing a check valve in reverse (flow arrow pointing towards the supply side vs correctly pointing at usage side) would do just that (5 seconds of flow then nada). A minimal amount of water could get past the valve based on the suction exerted by the pump which would result in a dribble of water.

Bill
Bill & Sharon Cassedy
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jimski2
#11 Posted : Thursday, June 02, 2011 6:49:44 AM(UTC)
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Sounds like some sort of restriction between the city water, pumped water and faucet. The accumalated pressure in the pressure tank flows water but the pump and city water can not flow at a good rate, just a trickle to fill the pressure tank, when the tank pressure falls, the flow almost stops. Does the pump have its valves fully opened?
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Ed
#3 Posted : Thursday, June 02, 2011 3:01:32 PM(UTC)
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[ Always remember, plumbing is simple. All you really need to know is S**T runs downhill and payday is on Friday. [/quote]


and, DON'T CHEW YOUR FINGERNAILS! Speak to the hand
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Bill
#12 Posted : Thursday, June 02, 2011 8:29:39 PM(UTC)
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[quote=verboatn;23979]I have been updating and trying to get running my new (to me) 1977 express's pressure water system. I put in a new Jabsco accumulator tank and a new city water input with pressure regulator. I updated the hoses in the closet where the pump is. The pump works and generates pressure. My problem is when I turn on the tap, pressure is fine, 5 seconds later it slows to a trickle. When I hook up city water and pressurize, the same thing happens.

Does anybody have any ideas what could be causing this?[/quote

Eh? If your taps are original they have a screen under the stems. simply remove the handles and take out the stem cartridge. Make sure the water pump is shut off when you do this. You should do one at a time. with one stem removed turn the pump back on and the water pressure will blow the screen out. Make sure you have a towel readyto catch the screen and water.Whistle
Bill
"ALUMINATION"
1975 Marinette 37' Fly Bridge Sedan
Twin Chrysler 360 cu in - 250 hp
Grosse MI - FYC
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verboatn
#13 Posted : Friday, June 03, 2011 9:55:11 AM(UTC)
verboatn

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Currently no new check valves. I will have to see tonight if there is one close to the water heater as per the Jabsco spec. The accumulator tank is between the city water and the pump. The city water should not be affected by the accumulator as it is not in line to the tap.

I'm thinking I have some sort of constriction (as per noted above). I'll try Bill's suggestion of removing the faucet stems and letting the pressure shoot out the screens and whatever else.Pray

Thanks everyone, I'll let you know.

Werner
Verboatn 1977 FB Express
Chrysler 318's w/Carter carbs
new Marinette owner
Docked Anchors Away, Marblehead, OH
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