My Quad Commander has started to read zero fuel pressure at idle. The rail pressure still reads 7000 at idle. If I travel at 65mph the pressure rises to 7 PSI but if I let up the pressure will drop to Zero. I changed the fuel filter but that did not help. The truck starts and runs good, if I did not have the guage I would not know there is a problem. I checked volts at the sending unit and I have 1.8 volts at idle.

Is this the fuel pump or a guage problem?

Thanks guys for the help this is really worrying me.

 

It's probably the fuel preasure sending unit. I'm on my fourth one in about 10 months. Call Quadzilla and tell them the problem. They will send you a new one.

 

Thanks bighorn

I called and Quad is sending a new sending unit.

 

received and replaced the sending unit. Works fine.

Ordered one day and received the next day. You can not beat Quad service!!!!

 

They made you pay for it?

 

Hi lxlaw

Good news and bad news. Good news is I only paid for shipping back but they held my credit card number until they received the old unit ( ok with me).

Bad news the (new)three month old unit is not working.

 

****, LOL, i just got mine in yesterday. I am curious if they could use the stock dodge oil pressure sending unit or another one that may be better. I noticed the one they sent me was an oil sending unit, so obviously it is just a generic sender. I wonder what is the ohm range of the unit they are sending us? I wonder what's the ohm range of the stock dodge oil sending unit. I believe the stock dodge sending unit also grounds through the plug, so if you have a fass with rubber lines, then you wouldn't have to worry about grounding the sending unit externally.

 

If someone finds a better sender let me know, Quadzilla has replaced mine 3 times, and this one is all over the place too. My manual pressure guage will read steady on top of the filter canister, I've also changed pumps as well, so I know it's not the pump.

 

I am on my 4th unit they are in the process of getting a newer heavy duty sensor/sending unit but it may take some time.

 

I know someone on here is electronically smart. Find out what the ohm range of the sensor they are using and see if there is a factory OEM sensor like from dodge, ford, chevy, etc.. that is in the similar ohm range. I know they have some adjustment on the commander for making it exact.