Engine/Transmission (1998.5 - 2002) VP beating fuel pressure gauge

[PVanderlugt]

Have a question for you guys.

Have a fuel pressure gauge installed, tapped just before VP. Didn't have any luck with the isolator, so I finally ditched it and plumbed it direct with a needle valve to reduce vibration/VP hammer. Problem I am having is I can not seem to find a medium on the needle valve between reduced vibrations and too far shut that the VP pressurizes the guage line and bents the gauge needle. (already destroyed one gauge). Was wondering if anyone has had this problem. wondering if tapping off further back (Airdog ?) would this reduce the vibration problem. trying not to destroy another gauge.

Pete

 

[aircop]

What was wrong with your isolater? I've been running one for 3yrs No problems at all.

 

[PRout]

After beating a couple isspro mechanical gauges into a rattle condition, isspro sent me a 3rd new gauge and an inline snubber to use just before the isolator (on their dime!- had to give them credit for that). That stopped the hammer. This gauge seems to be lasting. The only drawback to the snubber is it causes the gauge readings to be slower reacting than before. I liked the instantaneous response before adding the snubber, but at least seems to have rectified the problem. Might want to give them a call and ask about their snubber.

 

[Mishkaya]

Have a question for you guys.

Have a fuel pressure gauge installed, tapped just before VP. Didn't have any luck with the isolator, so I finally ditched it and plumbed it direct with a needle valve to reduce vibration/VP hammer. Problem I am having is I can not seem to find a medium on the needle valve between reduced vibrations and too far shut that the VP pressurizes the guage line and bents the gauge needle. (already destroyed one gauge). Was wondering if anyone has had this problem. wondering if tapping off further back (Airdog ?) would this reduce the vibration problem. trying not to destroy another gauge.

Pete

I have had similar issues in the past, my isolator would never last more than three months no matter what. I then used the needle valve approach with the gauge plumbed right by the VP44, same problem you had, either too far closed or too open. I then moved the Tee off the main supply line back to the firewall, and with use of the needle valve I now have an acceptable compromise. The gauge is probably a second slow in responding, but it is accurate and I do not have any rattle. To sum it up, moving the Tee back from the VP44 helped quite a bit.

mishkaya

 

[PVanderlugt]

Thanks guy's, I will give Isspro a call on the snubber, and keep in mind that moving it back will help also, I appreciate the help
Pete

 

[WestTN]

Use a glycerin filled gauge along with the needle valve. The filled gauge can better handle the pressure spikes from the pump.



The reason for using an isolator is to provide something compressible in the system to reduce the pounding from the uncompressible fuel.

 

[slomodiesel]

Autometer makes a snubber that works inline very well and the part # is 3279. It will protect your guage.

 

[CKelley1]

i built a snubber in about 15 minutes i took a 1/8" hex nipple and found a rod that allmost fit in the nipple i took laping compound and laped the rod into the nipple , cut the rod to same length as nipple and it was ready to place between grease gun hose and gauge kit