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Old 04-22-2007, 08:57 AM
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coolant pressure gauge ?

i had a hole in my water pump that i needed to plug. since i want thinkgs to look good, as well as work good, i had a new small Jegs 30 psi fuel pressure gauge lying around. so i put that in the hole, facing up. looked pretty good. the thing is, it didn't read any pressure . i figured it had an air pocket(though it still should have read something). and that after driving it, the air pocket would be flushed out. no such luck. the system did pressurize. after about 100 miles on it, it did start to read about 5 psi. but the needle was stuck there.

my question = what should i think about this ? as in, what could have gone wrong ? thanx

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Old 04-22-2007, 10:26 AM
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Unless the engine is very warm, there isn't much pressure in a cooling system. It does sound like the gauge might have a problem, because of the stuck needle, but some radiator caps are designed to vent at only 8-10 lbs pressure. 5 lbs might be a normal operating pressure under relatively cool conditions.

Bruce
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Old 05-05-2007, 07:59 AM
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i finally got around to fixing my stant pressure tester. the gauge works fine. i guess my cooling system doesn't build up much pressure
it does get up to about 175* . so i don't know what the problem is, if there even is one.
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Old 05-05-2007, 09:25 PM
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Doc here,

The difference May also be the temp and Media..

If your using a FUEL pressure gauge to read water pressure, the Media is THICKER (and dirtier than Fuel would be) And Fuel is Cool, Cooling systems are hot..The gauge may not be up to the task "Calibration" and orifice wise.

Both system and Gauge may be fine, just not compatible..

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Old 05-05-2007, 09:58 PM
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coolant

What # presure cap do you have?,most newer systems are 12-17 lbs.I think Doc may be onto something.System should build up presure as temp goes up. Check cap.
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Old 05-06-2007, 07:17 AM
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i don't know. its a billet cap, and i don't remember what the psi was. probably 15 or 12.

doc. interesting point. true, the gauge was not calibrated for a/f. but the stant pressure tester gauge was exactly the same reading as the fuel gauge. i'll have to check if the heat effects that.
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Old 05-06-2007, 07:25 AM
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Quote:
i had a hole in my water pump that i needed to plug. since i want thinkgs to look good, as well as work good, i had a new small Jegs 30 psi fuel pressure gauge lying around. so i put that in the hole, facing up. looked pretty good. the thing is, it didn't read any pressure
It doesn't Help much when you put a Pressure Gauge on the Suction side of the system............
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Old 05-06-2007, 08:14 AM
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Quote:
Originally Posted by bondo
It doesn't Help much when you put a Pressure Gauge on the Suction side of the system............
i had thought of that. but when i shut the engine off, there is no suction.
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Old 05-06-2007, 10:04 AM
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I have been thinking of putting this in the system it is off a boiler and measures 60-320* and 0-75psi on the same gauge sorry about the poor picture ED

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Old 05-06-2007, 01:00 PM
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steam gauge

no offence but why not a steam engine horn/wissitle[sic].Alarm will sound when steam up. My luck with billet caps has been spotty,try a stant cap
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Old 05-06-2007, 01:04 PM
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Quote:
Originally Posted by Ed ke6bnl
I have been thinking of putting this in the system it is off a boiler and measures 60-320* and 0-75psi on the same gauge sorry about the poor picture ED

I like it!!!!
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