Engine/Transmission (1998.5 - 2002) DiPricol Fuel Pressure Ga. Problem

[Smokewagon]

I am not running an isolator, I have had the Ga's in for about 10 months or so, Fuel Pressure ga. acts fine until about a month ago. Problem is, the needle is not steady. It doesn't jump from pressure to pressure unnormally, ie idle, under excelleration etc. I was told that there was a prior thread regarding such, but I have did search after search and can't find what I'm looking for. Does any of you guys know of this problem? If so, what's the fix? There is no adjustment on the ga. that I can see. I'm sick of hearing the raddle of the needle



Point me in the right direction please!



Thanks, Dave

 

[Rob Thomas]

Sounds like you need to add a needle valve. You can get one from Grainger for less than $5, add it in-line and just "crack" it open slightly, no more rattle. What I believe happens is that the air is bled out of the line (over time), and then it's all fuel, the air in the line will dappen the vibrations. If you disconnect your fitting, let the gauge line drain (just a few seconds), and reconnect it, the rattle will be gone, but will eventually return. After I installed a needle valve the rattle has not come back.



http://www.grainger.com/Grainger/productdetail.jsp?xi=xi&ItemId=1612835462



Rob

 

[Smokewagon]

THANKS ROB!

I appreciate your help! I was told of this, but am unsure of installation (according to pic)? Once again, thank you for your help. If you don't mind, please touch on the install part.



Thanks, Dave

 

[Rob Thomas]

Dave,



The fitting in the link above is 1/8"NPT female on one end, and 1/8"NPT male on the other, simply add this midstream of the line to your gauge. If you have one line from the gauge to the tapped banjo on the fuel filter (which should be 1/8"NPT) just remove the gauge line from the filter, thread the needle valve into the tapped banjo, and then the gauge line to the other end of the needle valve. (you can use permatex #2 for thread sealer if you like, but do not use teflon tape) If your set-up is different than this, you should still be able to get the idea, if not let me know, I'll fetch a pic.





Rob

 

[Car_nut57]

You should also take a look in the back of your gauge it should have a dampening orifice screwed into the back of the gauge which prevents this. It may have worked its way out.