Not switching

[EX ON OIL]

Maybe I'm sucking air or have pluged lines. About 50% of the time my system does not come on. I pull over and get out and tap on the purge solenoid with a hammer ond the system comes on instantly. In July I changed the purge solenoid but that did not cure the problem. Any thoughts.

[captgrady]

If you install a pressure gauge @ the schrader fitting on the V3, it will make trouble shooting much easier. Also First, use compressed air to blow out fuel line & blow into V3 fuel intake fitting w/ screen filter removed to make sure there's nothing trapped in there. Is your tank gettin' hot? When was the last time you changed your Donaldson?
Oh yea, love the name!

How far are you from Manitiwoc?

[Elvia]

The hammer bit could be a loose wire, or bad connection somewhere.

[Marv]

I'd check for loose connections. I'd also check the pressure switch as well as check/clean out the pre-filter screen.

What driving conditions are you in when the system cuts on and off?

[greasyX]

could be knocking media off pre-screen,then engaging system.Check pre-screen,highly over looked.I keep the allen key in the glove box,right next to the blue,and black CPS's.Also I had a fass with dead spot on the electrics,similar symptoms ask Jason,he'll remember ,maybe he can help you with some deductive reasoning.......good luck........

[EX ON OIL]

I have V-2. I'm not aware of a pre-screen, where is it located? Durring start up and warm up I leave the system off to prevent excessive clicking. Once warm I turn the switch to auto and it sometimes works and sometime not. If I do a quick shut down at the drive thru it will never come on with out a tap with the hammer on the brass body that the purge solenoid is connected to.

[Wilson]

EX ON,

Interesting indeed.

I just got a call from russel1b on the boards here. He is local to me and having the same issue. Look for his post in the Excursion forum and shoot him an email. He's willing to share what he knows I'm sure!

[EX ON OIL]

Does anyone know if I have a screen that needs cleaning? I have a V2.

[Clay]

Does anyone know if I have a screen that needs cleaning? I have a V2.

No screen on the V2.
Keep the hammer away from it though....lol. My first thought is to check all the electrical plugins on the module by wiggling and pulling wires to see if anything comes one or goes off if that doesn't work the FASS pump maybe over torqued to the plate and is in a bind. Back those mounting bolts off about 1/8 turn...not so they will come out by them self but you get the idea. I saw this happen a few times. Worth a try...If that doesn't work, pull the pump and look inside those gears, see if you see any trash in there. There is no prefilter on most of the V2 systems but some had a prefilter inline up by the tank pickup. If you have one, it will be a clear glass filter element about the size of a roll of quarters...clean it or replace it if you have one. If thats not it, pull the pickup line in the tank and see if there is a screen on the end of it. Some did have this...remove the screen completely.
As stated before, you can narrow down this guessing game if you take a pressure reading on the schrader valve. A regulare tire pressure guage will do it although it will make a little mess when you take a reading with the pump on.

[EX ON OIL]

Thanks Clay for the tips. I get on it this week end and get back to everyone.

[lamintdog]

Durring start up and warm up I leave the system off to prevent excessive clicking.

What clicking are you getting when the switch is in auto prior to the engine being up to temp?

Definitely either electrical or pressure related. Does your purge solenoid function properly? Unhook the return from the tank and put into a bucket to verify it's returning oil. If so, wiggle wires and try again. If it still works, my guess would be it's a pressure problem...

(Maybe your purge solenoid isn't closing all the way [potentially creating a pressure issue] and a hammer tap closes it? - Try driving around with your purge returning to a dry bucket and see if you're getting any dribble out of your return line when the system is on and running?)

Has your system sat for any extended period of time without oil actively flowing through the lines? That could potentially cause buildup...

As previously mentioned, take a pressure reading at the schraeder valve and see what you're getting when the system is on... if it's low, then you've either got a leak (or a plugged filter) somewhere... whether from the solenoid not closing all the way or your filter not screwed on tight,etc...

Do you leave drip spots anywhere after the system has been running? If so, under what component/area of the system?

[EX ON OIL]

Today wvo tank was at 1/4 and took a turn a little fast and the green light went out. Once home I used the tire gauge to check fuel pressure and it was at 85psi. The pump was running, wiggled wires looking for loose connections and green light would not come on. Then came the tap with the hammer on the purge solenoid's brass body, witch is also connected to the pressure switch, and on came the green light. Pressure switch bad?

[Fordnut74]

Ex- After reading through the thread I would vote for the Pressue switch as well. We are in the process of changing vendors on our pressure switches. I can tell you that the new vendor has FAR FAR exceeded the old vendor in lab testing. Although typically this only happens in higher current draw situations. It will be a few weeks before we have any of the new pressure switches on hand.

[EX ON OIL]

Thanks Jason, It took awhile to try a couple of things but today I agree it's the pressure switch. After a shutdown of 10 sec purge and 2min run and off for 5min. Return to vehicle, restart and drive for 10 miles the system did not come on without friendly tap with trusted hammer. Thanks to all that helped I will follow up on how to order new switch.

[Fordnut74]

We are in the process of changing vendors for our pressure switches, SO shoot me a friendly reminder via email and I will get one of the new ones out to you as soon as they come in, under warranty of course.