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Fuel Pressure Issue?

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This morning I started my truck and I am sitting a very nice 18psi at idle and 15.5psi at WOT, nothing wrong here just normal everyday stuff. Temp outside is 68*F around 2pm

 

Just now I went to the corner store and I started my truck, mind you there is not hard start, and I noticed the fuel pressure is sitting at 12psi at idle and 10.5psi at WOT(for a very short run). Now the only conditions that have changed is the weather. It is currently 9:15pm outside and the temp is 30*F. Now I am hoping this is just because the temp difference is such a drastic change that the fuel is thicker? I also have a little less than a 1/4 tank in the truck. 

 

Is my fuel pressure this low because of the drop in temp outside or do I need to look into something else?

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  • Owner

NAPA - PN# WH6820 roughly $8.00 for a the needle valve in the picture. NAPA also sell all the 1/8" NPT brass fitting too for fair price.

  • Author

NAPA - PN# WH6820 roughly $8.00 for a the needle valve in the picture. NAPA also sell all the 1/8" NPT brass fitting too for fair price.

 

I need a double female 1/4 NPT. My plan is to remove the isolator completely and remove the 1/4 NPT fittings that are attached to it that connect the fuel hose and the gauge. So one side I can screw on the needle valve and then I can take on the quick dissconnect compression fitting vulcan includes in their kit and screw it in the needle valve and then re connect the 1/8" tubing. Should be a quick fix. I will call Napa since they deliver to my work lol.

  • Author

Well I installed a needle valve inline and removed the isolator. All I can say is the isolator I got must have been a piece of ****. I fired the truck up and instantly 18psi again! Thanks for the help guys. I am happy with that instead of 3.5-5psi I was showing...

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    Hidden by Mopar1973Man, January 10, 2014 - double post

    Well I installed a needle valve inline and removed the isolator. All I can say is the isolator I got must have been a piece of ****. I fired the truck up and instantly 18psi again! Thanks for the help guys. I am happy with that instead of 3.5-5psi I was showing...

    • Owner

    Well I installed a needle valve inline and removed the isolator. All I can say is the isolator I got must have been a piece of ****. I fired the truck up and instantly 18psi again! Thanks for the help guys. I am happy with that instead of 3.5-5psi I was showing...

     

    Most isolators behave this way. Just really rare to see a working last for very long either.

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    Welcome To Mopar1973Man.Com LLC

    We are privately owned, with access to a professional Diesel Mechanic, who can provide additional support for Dodge Ram Cummins Diesel vehicles. Many detailed information is FREE and available to read. However, in order to interact directly with our Diesel Mechanic, Michael, by phone, via zoom, or as the web-based option, Subscription Plans are offered that will enable these and other features.  Go to the Subscription Page and Select a desired plan. At any time you wish to cancel the Subscription, click Subscription Page, select the 'Cancel' button, and it will be canceled. For your convenience, all subscriptions are on auto-renewal.