Isspro Guages
 

Installed a set of Isspro guages and A pillar in my 97 2500 5.9 and am very happy with them except that this weekend after driving about 150mi or so the fuel press guage started making a clicking sound much like a collapsed lifter and then the guage would not read more than 10psi and is very slow comming up from 0psi from start now any ideas would be appreciated, Thanks

How and where is the FP guage plumbed in? Are you useing a needle valve, snubber, or grease gun hose to dampen the pulses from the P-7100?

Isspro Guages
 

I ran the fuel side of the guage to the top of the fuel filter housing to the isolater- then filled the line with antifreeze to the guage side so there wasn't any snubbers or anything like that with the kit.

Probably need a Snubber :pm:

The problem is the isolator...ditch it.

Run fuel to the guage temporarily (or another test guage) and you will see what I mean. You should have a needle vlave in there to dampen the pressure spikes. and I would take the pressure off the Fuel pump inlet banjo bolt (you will have to tap it 1/8" NPT). I will try to find a pic for you.

It might be the isolator but not as you may be advised it is. Check the connections and ensure that it has fluid in it - the high pressures from the P Pump will quickly bleed this little thing dry and it will not work as intended.

Sorry, you are correct Wyatt - I should have said that the problem LIKELY is the isolator.

Isspro Guages
 

Thanks for the help, but could you please explain what the snubber is and where I might get one and how I would install it
Also do you think the guage is still ok or will I have to replace it as well-- I have only put about 300mi or so on it

A pressure snubber smoothes out the pressure spikes that are caused by the injector pump.

You can get it here: (sorry theres no pic):

http://www.vulcanperformance.com/ser...Snubber/Detail

or get a needle valve:

http://www.vulcanperformance.com/ser...h-8-NPT/Detail

Both do essentially the same thing.

I suspect the problem still lies with your isolator.


Gauge might be good or bad....if you are concerned, send it back to Isspro. I think they will deny warranty if you run fuel into the guage. Which guage is it BTW?

Yup, no isolator = no warranty.

Isspro Guages
 

No, I never ran fuel into the guage-It was a 0 to 60 psi 2inch Isspro guage That I purchased from Vulcan Performance and I have talked to them and they have been good about wanting to back up the product but now I just have to figure out the problem which you all have been good about helping me with-- So now I wiil talk to them about a isolater and snubber set up and hopefully get back on track again, Thanks

clocker, reread my last post...I dont think a snubber is going to fix your problem. I believe the problem is with the isolator. are you sure you installed it correctly?

Did it work correctly at the start?

What kind of pressures were you seeing? You should have seen around 23psi at idle and around 36 psi at WOT...

Isspro Guages
 

Dr. Evil, I am pretty sure I installed the isolater correctly, The highest psi I saw at idel was about 12 to 15psi and at wot around 20psi and like I said now it shows around 10psi all the time.
It seemed to be responsive to the throttle when I first started using it until it started making lots of noise and now I may have to run down the road a couple of miles before it comes off of zero.

This is likely because it is EMPTY or has air inside the line. A 12V truck like yours with no other fueling problems will see 20+ psi at idle and as high as 40 or so at WOT. If it sits at 10 all the time it is air locked and the isolator is empty.