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Old 11-18-2008, 07:06 PM
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Default Pressure Switch Issues

It's no surprise that all of a sudden we are having issues with our pressure switches and are quickly working on a resolution. Stay tuned here for updates. The two common issues are either the green light staying on all the time(older style) or leaking(newer style).

Just a quick explanation of what the pressure switch does. The ONLY thing it does is switch off the diesel pump when the Vegistroke reaches operating pressure. The pressure switch has NO affect what so ever on the timing or temperature controls for the V3. The only possible problem that can be caused by a bad pressure switch is a malfunction of the Diesel pump. That can be easily fixed by installing the 3pin jumper plug that comes with the kits, just in case something like this was to happen.

So what does this mean for oil use? well it means that the diesel pump won't be shut off and the engine will run on whatever fuel has the higher pressure. The OEM pressure varies by as much as 20 psi, so each situation will be different.

How to test: An Ohm meter or multimeter will be needed. The old style switches will have black, red and blue wires. With the system in the off position Unplug the switch and do a resistance check between all three wires following the below order:
Black to Red- Open
Black to Blue- Short
Red to blue - Open
Any reading other than listed is a bad switch.

The new switches have red, black and green wires.
Black to Green - Short
Black to Red - Open
Red to Green - Open

Again any reading other than listed is a bad switch.

Any questions please feel free to call, just be patient!
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Old 11-18-2008, 07:18 PM
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Good stuff! I had actually forgot the procedure for checking that switch.

Thanks for the info Jason!
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Old 12-17-2008, 03:02 AM
stymous222 stymous222 is offline
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any update on the pressure switch issue?
thanks
chris
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Old 12-17-2008, 05:47 AM
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As a matter of fact there is. First, we are going back to the original vendor of the pressure switches that do not leak and whose only issue was not being able to handle the rated current. Second, we have come up with and tested a relay that will be wired in between the existing wiring and pressure switch plug that will allow the current for the Diesel pump to be handled by the waterproof 30a relay. This will be a permanent fix. The downside is that the rollout will be slower than we would like. Those who have been broke the longest will be replaced first.
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Old 12-17-2008, 10:25 AM
stymous222 stymous222 is offline
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thanks for the update.
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Old 12-17-2008, 02:20 PM
Clay Clay is offline
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Would this have anything to do with my loss of pressure on WOT?
I noticed again last night when the system was on, i had 75 psi and stomped on it and i saw the light flickering off and looked at the pressure guage and it was down around 55 ish. Its not a real big deal but it should not do that i don't think.
Wonder if it would do that with my stock tune in? I'll have to try that but i hate stock!
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Old 12-17-2008, 05:22 PM
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Quote:
Originally Posted by Fordnut74 View Post
Those who have been broke the longest will be replaced first.
I hope I am at the top of the list. The quick fix is working great but I miss my "Automatic V3". You should have receive the 3 leaking pressure switches that I returned.

Marty
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Old 12-22-2008, 04:23 PM
Paul Leeber Paul Leeber is offline
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Default green light glowing low

EDITED

I moved your flaming post to the admins section where it won't be in the public eye and it will be more likely to be seen by Jason.

thanks and please keep flaming to private messages directed at the persons involved only.

Last edited by Clay; 12-22-2008 at 09:37 PM.
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Old 12-22-2008, 04:32 PM
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If you're referring to the constant glow of the switch that has been discussed here several times, that is normal. If your just saying that the light is on, but only slightly dimmer than normal, that is different and I can't comment.

Search for the first scenario and see if it matches yours. There are 2 lights in the switch.
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Old 12-22-2008, 07:40 PM
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Quote:
Originally Posted by Paul Leeber View Post
Pauls edited post
Does your green light go off when you turn the switch to the off position?
If it does not go off you are getting voltage from your vegi pump to the pressure switch. I am currently running my V3 with the pressure switch pluged and a toggle switch wired to my diesel pump. The V3 run flawless it is just not automatic. I understand you are frustated but I would not call this junk. DFA has had problems with the presure switches and they have found a solution. I am still grinning when I pass the diesel pump.

I have never had an issue with Jason, James, or John calling me back. Keep trying. Also check out my "leaking pressure switch quick fix" post for more information. http://dinofuelalternatives.com/DFAf...read.php?t=448
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Last edited by Clay; 12-22-2008 at 09:38 PM.
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