I just bought an isspro ev2 FP gauge with banjo bolt and snubber and was wondering if it's recommended to put it at the vp44 or at the bottom of the fuel filter housing? Thanks.

 

at the VP. the pressure may drop a little after the filter, plus the sending unit will get filtered fuel (not if it matters?)

 

The bottom of the filter where the vp supply line attaches is what I was talking about which would be post filter not prefilter so it would be getting filtered fuel either way. I guess I'll replace the banjo at the vp though and attach it there.

 

Either place should be fine. Bottom of the filter is post filter and should read the same as at the VP(it is approx 2 feet away). Some feel that the farther away from the VP the better due to the pulsations of the vp beating on the sender. However with a snubber which is supposed to help keep the pulsations from beating on the sender should make that a mute point.

 

When I had the drilled banjos, I pull my fuel pressure reading from the banjo at the VP44 inlet. When I switched over to stainless lines and AN fittings, I relocated the tap to the fuel filter outlet. Either works perfectly fine, I just moved mine because it worked better with my plumbing.

As long as you're post-filter, you're OK since it will allow you to monitor pressure drops as a result of a clogged filter.

 

I got the gauge installed at the vp but have a question. The gauge is very "jerky" like. Have any of you other guys experienced this with an electronic gauge?

 

oh duh! i knew that. yea either way is good. but the jerkyness im not sure of b/c mine is mechanical.

 

You need to install a needle valve to eliminate this problem. It's important that you do as the pulsations from the VP44 are causing this, and they will destroy the gauge sender in short order if you don't. A quick trip to your local hardware store, and a few fittings are all that are needed.

 

I have the snubber though. I don't need a needle valve when I have a snubber right?

 

i had my pressure gauge on the vp44 originally.

i have since moved it to the bottom of the filter housing.

i did so for two reasons.
1) pulsations are less severe
2) i felt as though the fuel flowing by the sender was cfreating a bit of a venturi and actally pulling the fuel in the tubing away from the gauge. the new setup uses the tapped 90 degree pushlok from vulcan - the fuel flows directly towards the sender and then makes a turn rather than just flowing straight by it. i noticed a bit of a change as the fuel psi drops less now upon hard fueling.

just my 2cents . . .

 

Snubber or needle valve will make little difference in an electric sending unit since there is no volume change, unlike in a mechanical one where it fills a tube inside the gauge. Need something like an accumulator to take the pulsations out of a electric gauge.

 

im having the same problem with my ev2 fg and its inline between the vp and fuel filter

 

Well, mine has now started to go from about 8 psi to 20 back and forth intermittently and will not read correctly. I can unhook everything though and for about a day it will work fine and then start to do it all over again. I called the place I bought mine from and they said there is a good chance I just got a bad gauge so I'm going to send it back under warranty.

 

rattlebox when you get through playing with that piece of junk you can connect a good gauge up for less than $30 get a oil pressure gauge installation kit. it has all of the fittings needed and 6 feet of copper line. the cost is between $7 and $15 depending on where you get it next get a 30 psi full scale glycerin filled gauge from northern or surplus center for $8 and you are done.

 

I think it would be very helpful if someone would do a write up on how to install one of these things or if theres a link to one that someone could post up.