Well I just installed a new boost pump from Glacier on my 02. Everything went well except the removal of the old OEM pump. I did not remove the wires plugged into it before removing the nuts that hold it on. I thought I would have ample wiring so I could get it out where I could see it. Wrong. That part of the wiring harness is only long enought to make the connection. I could not get two hands down there so one could hold the pump and the other pull the plug. Got one nut back on it then I could get to the connector with a narrow nose pliers and pull it loose. Remember unhook the wiring first.
Now to my new situation. My fuel guage now reads 7psi, period. Does not fluccuate at all. Even stays up after turning off the key for quite a few minutes. I know it has more pressure than that. Richard at Glacier did tell me when I ordered mine that he does not like the isolators we use between the pump and the guage. Not sure if I should hook direct or not. Anyone have insight into this problem?

 

Are you talking about a the walbro pump? Did you buy just a pump or the kit with the bypass valve etc

 

I bought the whole kit. Not sure about the name of the pump but you may be correct. I can hear fuel flowing back into the tank via the bypass so I know things are working properly.

 

I intalled the 392 kit in my '02. Richard is excellent to work with and knows his stuff. When i first installed a fuel gauge, I used and isolator but had troubles so I went with a westach electric and works great. Im not sure why yours would be givin you trouble. It should easily handle the pressure. I love my walbro tho. Works great. I did have probs at first but not from the kit. I got a bunch of crud pumped into my tank and caused major problems. Im sure I got the crud because the oil dealers were switching to the ulsd fuel and pumpmed there tanks down or empty and guess where the crud ended up? But I got it workin and is great. You will love that new system. Call Richard and he will help ya thru it.

 

I just remembered what happened to me when installing the kit. I somehow tore the inside of the hose when i intalled the end on the hose. It was the end that screwed on the tee and the hose goes from there to the filter. The little rubber tear acted like a flap and plugeed my line enough to drop my pressure. I found it by just loosing both ends and blowing thru it with my mouth. Make sure it is empty of diesel tho, lol, ya might get a weird hang over. Also if you took the bypass make sure you put the spacers back in right so that one didnt go all the way in or something. Do you have the inline filter installed ? Maybe it got pluged by crap. If not the filter, which you better install one, check the inlet end of the pump. It has a screen in there and can plug from crud and wont take much either. I learned this the hard way. You will be surprised how much crud builds up in the tank. If all of the above checks out ok, then the next thing is check the sump in your tank. The screen on the bottom can and does eventually get plugged. You gotta take the tank off for that one but isnt that bad of a job.....did it 3 times here!!! Just some ideas .

 

I have not run it long enought for any filter to plug up. Just started it and went 1/2 mile down the road and back. I don't think anythink is wrong except the gauge is acting up. Ya know, sometimes having a gauge is worse than not having one. If they are acting up and the will, it will make you paranoid. My trany gauge went all goofy the other day. I emagined all kinds of things. I jiggles the wires and an tightened the screws a the modlue on the firewall and everything was OK. Made me nervous though.

 

Do you still have banjo bolts, or did your new kit eliminate them?

 

There are no banjo bolts between the tank and filter. Near as I can tell that elliminated two of them.

 

What year truck? What brand fuel pressure gauge? Did you have this problem before the retrofit of the new pump? If not, you can exclude the tank for now.

I'd be looking at a cheap mechanical gauge to test at the VP or at the fuel filter. I think you're on the right track with the gauge.

 

The truck is an 02. The guage is Pricol. It has acted a little strange every since the original isolator needed replace but it did at least flucuate. Now it just goes to 7 psi and stays there.

 

Blackhawk
I would be willing to bet that your isolator is the root cause of your problem. I can tell you I went through three isolators with my Pricol gauge before I decided to just forget about the isolator (that was a year and a half ago and I haven't had a fuel leak at the gauge yet). I had similar issues with my gauge when the isolator started to go bad, first it would just show lower and lower pressures and finally it pretty much stopped at a given pressure same as yours is now. Good luck with your problem, I hope you find the answer soon.
mishkaya

 

Try a needle valve that is barely open instead of the isolator. I'm running one thanks to advice of dtr members and it works great.

 

I have now gone direct from my injector pump to the gauge. Eliminated the isolator. Have 16- 17psi at idle and goes to about 14 when I romp on it. Have not pulled the trailer yet but I now know I have ample fuel to bath the pump.