water pressure guage
 

guys, what would cause no water pressure, gauage shows 0. have new water pumps and motors are not running hot, motors are 525 hawks. also gaffrig gauges are new. thankx scott

Hey another LA boater, welcome!

Im sure you have checked all the basic stuff, senders, wires, gauges, grounds.

Are you running the boat on the hose in the driveway? Some pressure gauges wont register when running on the hose. On my Fountain if I use the ear muffs it will show no pressure. If I use the flush system it just barely shows some pressure.

Where do you boat?

Ron

I added 1 this year and had to play with it a little to get it to work. 1st I had overtightened the compression fittings which will crimp the tubing. They need only to be snugged up. Then I had to blow the tube clear from the guage back. It only take a little rust/ect. to clog the tube. Also mine will only show about 1 pound on the hose. Good luck

RON, WE RUN ON THE OUACHITA RIVER IN MONROE LA, WHICH IS NORTH OF BATON ROUGE ABOUT 3 HOURS. I THINK THAT THERE IS RUST OR SOMETHING IN THE TUBE THAT RUNS TO THE GUAGE. THANKX SCOTT.

Make sure its even hooked up....sometimes these engine guys drop motors in and forget to get down there and hook it up.

Scott,

If the engine is pumping plenty of water and your temps are not increasing, chances are you have rust or other debris in the pressure line. Are you plumbed off the boss just above the oil pan rail? If so, as sediment etc settles in the water galleys, the small line for water pressure will clog. Easiest fix is to pull the line from your dash and from the engine and either force water or air into the line to clean it out. This may become a regular necessity :( I have triples and usually 1 out of 3 aren't working but the innercoolers are pumping well and the exhaust is flowing fine.

Hope it's OK.

Steve

If it is a continual problem, why not put the pickup on the intake?? That's where mine is located and it has yet to clog---and I boat in the Ohio RIver!!!HAHAHAHA

I get 1-2 lbs ont he hose as well.

What's up CFD12??? River Wed???

My water pressure lines would plug-up with sand every weekend.

Low water pick-ups were added when we installed Whipplechargers

I removed the lines from the stock location, about 1" above the oil pan on the side of the motor.

I installed pet-cocks in that location.

I reroughted the lines to a T fitting, along with the water tempature sending unit @ the front of the water crossover.

45 lbs at cruse and no more problems.

Steve

You have 45 lbs of water pressure. That is WAY HIGH. Max should be less than 30. I think it could have something to do where it's mounted. Sounds like you are measuring the pressure before it enters the engine.

guy, started both motors after i cleaned both pick-up tubes, and still the gauge reads 0 . the pick-up tubes come out of the blocks right above the oil pan. should the location matter? thankx scott.

When you disconnected the fitting on the block, did any water come out???? If not, your obstruction is in the block at the fitting. Just use a piece of wire or similar into it and clean out that area. BTW, if you are doing this on a hose, you may not see anything on the guage. Mine shows 0 on the hose and about 20 at WOT.

My water pressures are where Griff's are. (Same pressure we run in the F-275 FOUNTAIN GMC 18-24 lbs at WOT). As to location, I have found different readings if mounted by the intake as opposed to the lower block area. It's the pressure in the block that counts, not the incoming pressure, although both are related. Anything above 35 lbs. and you'll soon be blowing gaskets or in some manner experiencing water seepage.

Steve

If the pressure line is just above the oil pan....MOVE IT !!!
The tiniest bit of rust or sand will plug the line. Install it into the intake or the thermostat housing....if you are not running a thermostat. Mine never worked until I moved it.

I've had them in the thermostat housing (on the input side)coming from the oil cooler with no problems. And that 's in the scuzzy Delaware river:p .

Mopower,

Now if the Delaware is scuzzy, I'm wondering what you would call the Schuykill at Norristown/Port Indian? We use to race our 7 Litre Hydro there in the 80's and heaven only knows what that "stuff" was that we stepped into and then sank about 18 inches. I think I have an idea, as anytime anyone flushed along the "river", the water level rose...... YYYUUUCCCCCKKKKKKKKKK.

As to where you've plumbed your pressure guage, did you (or anyone) notice a change in the pressure readings from the block sending position (assuming at some point it was reading OK?) and the T-Stat housing area??

Thanks,

Steve

SD ,
Can't say if the pressure changed from the lower block to the thermostat housing , because any time I drained the block(down bottom) I had to stick a screwdriver in the hole and break things loose to get the water flowing. For that reason I never used the lower holes:p
I used to go up there for the races in the late 60's , as a friend of mine had a 16' hydro in the "150" class. 6 cylinder Falcon with Algon fuel injection running on methanol. Boy would that stuff burn you eyes.:cool: Actually the river has gotten better...some times you can see your ankles in knee deep water:rolleyes:
BTW
This winter I'm putting Graffrigs in my Formula (including water pres.) and again I plan to use the thermostat housing..
My main reason is to detect those plastic bags in the water BEFORE the engine/engines get hot. Been there...done that:mad:

Thanks MoPower!:D

The 150 class was & is awesome. Today they are called 2.5 Litre modifieds, with a wide array of engines. Everything from Datsun 240 Z engines to older BMW in line 6's to Fieros', sleeved and destroked 215 alum. Buicks, full on 2300 CC Pintos, etc.

I had some great rides in that class, mainly in A-82 HONCHO, a Sooy hull with a 240 Z engine, A-122 owned by Dick Kelly with a Pinto built by Alderman, in Cahoots, a Staudacher with an exotic in line BMW, turned over 9000 RPM and didn't break. :eek: :eek:

They are running better than 130 MPH and averaging almost 100 on a 1 2/3 mile course. Imagine that in a 16 foot hydro with app. 155 cubic inches!

Thanks for rekindling yesteryear :)

Steve