My FP gauge started rattling last week (I think). There is a noise coming from the gauge pod where the gauge is and the needle is erratic. I do have a snubber on the line, I need to try opening it up a little more. Is it common for the iSSpro gauges to go south?

~Rob

 

Try closing the valve farther down on it. I had to do that to mine. Close it all the way and then crack it open just enough to get a reading.

 

Mine did the same thing. The fix for it was to close the needle down. Mine is barely cracked and in fact it is a little slow to respond - It might take a second for it to read correct values for a pressure fluctuation but it is accurate according to a mechanical guage plumbed under the hood and it has completely eliminated the noise and fluctuation. Mine is plumbed in on the pressure side of the filter, no isolator and grease gun line to the needle with hard line from the needle to the guage.

 

I have to adjust my needle valve sometimes with the seasonal temperature changes.
If I start hearing it buzz, I just close the needle valve all the way, then open it just enough to get a reading that drops off quickly when the engine is shut down.

 

Another fix is to close the valve completely (this prevents air from getting into the main fuel lines), and disconnect both end of the gauge pressure line. Then blow out the line. You want to get all the fuel out of the line. When there is nothing but air in the pressure line, reconnect it. Even with air in the line, the gauge will still read the proper pressure, without the annoying rattle. I did this just last night in fact. I find that I have to do this every 6-8 months as the line eventually fills back up and starts rattling again.

 

OK - I'll admit I'm lost - I have an ISSPRO mechanical FP gauge plumbed off of the top of the CP3, through an isolator and then into the gauge pod. Where / how do I adjust this setup to stop the rattling? I have the rattling the same as others, and need to (I guess) have better instructions on how to fix it.

Thanks - sorry to be a pain.

 

The diaphragm in your isolator is more than likely shot and you have fuel to the gauge hence the vibration/sound. I would eliminate the isolator and get a shutoff valve, put that in place of the isolator that way the rest of the instructions make sense, or replace the isolator and plan on replacing it again down the road.

Good luck.

 

Mine started doing this also. I had air getting into the line. Were it was seaping out of the gauge. Double check your connections first and then try closing the valve like others have stated.

 

I used to have the islolator, then it failed.

Then my gauge running fuel directly to it started rattling.

So I fixed the problem in a way that was cheap, completely effective, and requires ZERO maintenance (no periodic disconnecting).

A liquid-filled guage!!

$20 from Jeg's:



NO snubbers, no rattles, no maintenance, no problems.....

 

Hey Justin - that's cool, but is OK to use in freezing temps? I'm assuming it's filled with some kind of no-freeze liquid - just thought I'd ask.

 

It's filled with glycerin, I think.

All I know is that it survived -24F North Dakota temps with no problems. That's good enough for me.

 

yes liquid filled guages are glycerin