Diesel/Veg pressure lower, unsteady

[VegObsession]

My system is acting a little strange. Suddenly, my pressure gauge(linked into the V3) is now reading 40-50 on diesel and 75-80 on Veg. At idle, the pressure seems to waver about 10-15psi on diesel and veg. I wonder if there is some air trapped in the lines. I don't think it is the filters b/c this happened at the same time on diesel and veg. This has been going on for about 10 days.

Any insight?

J

[Marv]

Well, the readings your seeing (I assume) while running down the road look okay. 40-50 for diesel and 75-80 on vegi sound in the ballpark to me.

What exactly do you mean "waver"? Are you saying that's the difference between diesel and vegi when you switch back and forth, or are you saying the gauge/pressure simply fluctuates 10-15psi when you're idling?

Could be air in the lines. Have you cracked any of them open here lately? I'd also check the connections on the gauge to make sure they're not shorting and are good and tight.

[Tampa450]

My system is acting a little strange. Suddenly, my pressure gauge(linked into the V3) is now reading 40-50 on diesel and 75-80 on Veg. At idle, the pressure seems to waver about 10-15psi on diesel and veg. I wonder if there is some air trapped in the lines. I don't think it is the filters b/c this happened at the same time on diesel and veg. This has been going on for about 10 days.

Any insight?

J

I dont have fuel pressure gauges..... but I was under the impression thats how the system is supposed to work.

ie. veggiestroke kicks on - higher pressure WVO goes to the motor - if the pressure drops, diesel is always there at a lower pressure to supply the engine

[lancaster,pa]

Clarify please. I believe I am correct in saying that when the V3 is warmed up and comes up to pressure, the diesel pump shuts off. If the pressure from the V3 drops for any reason, the diesel pump is turned on again to provide pressure to continue running on diesel. Thanks. - Patrick

[greasedltn]

Correct, when the V3 hits correct pressure the diesel pump cuts off. If V3 pressure drops below spec. diesel pump comes back on. This will also extend the life of your diesel pump since it doesn't circulate diesel fuel all the time. Also if your return line for the diesel gets stopped up somehow (I've heard of it happening) it could overpower the V3 pump and your green lite would be on, but still running diesel.

[Clay]

If your seeing pressure variables of 10-25 lbs on both systems your guage is likely faulty.