Shopping for a new vp. I am going to call industrial about their setup on Monday.

 

If you have the Cash spring for the Hot Rod VP44....

 

There is one other way to maybe fix your problem. Do you know anyone near you that has a smarty? The reason that I am asking is that the samrty has the newest dodge ECM program on it. That being said what this will do for you is when you install the smarty and uninstall it, it will put the newest version of the dodge software in your truck. The newer revisions of the ECM software will not signal the lift pump to run until the engine has started or you disengage the starter. This would be something eazy to try and would not cost you anything.

 

Installed an Industrial Injection VP44 this morning. Started right up and runs very well. Need to take it for a drive to determine if there is any improvement.

I do have one problem and that is fuel pressure. A few months ago i installed a Quadzilla recon electronic gauge and noticed that my fuel pressure was all over the place (0-11psi). As a result I purchased an Glacier setup and removed the stock setup. Fuel pressure ~17 - 19 psi but then had a hot start problem come up. Vp was replaced but know the fuel pressure fluctuates from 0-10 at idle and 17 psi at cruising speed.

Would a fuel leak cause this pressure drop?

There is a pre-filter and I recently changed the primary filter.

 

This is a strange one. A leak in the lines could cause a fluctuation in fuel pressure and if it was between the tank and the lift pump could suck air in and not leak fuel out. But if this were the case it should read lower pressure at WOT then it does at idle.

The only thing I could think of would be if for some reason your pump is not getting enough volts at idle, when you are on the pedal it is sending more voltage through the system. I assume you are using the stock trigger running through a relay to turn the pump on and off. I would start by making sure you have a good ground on the relay. Maybe use an ohm meter to see if your getting good power through the relay since the problem is at idle, this will be easy to do. I would also run your hot wire right off the battery, that is the most fail safe juice you have. Another good source is the starter lug, but I preffer the battery myself.

The first thing your gonna hear from others is don't trust that electronic guage. Set up a mechanical guage to test it with.

 

This is exactly how my Fass is setup. Turn the key to the on postition, you can here the pump turn on for a second and the fp guage goes to 20 then settles back to zero.

Start the truck and the fp comes up. It's at zero while starting.




YES. At least double check against a good mechanical guage to make sure your set up is reading the same or pretty darn close. That would be a good idea.

 

Your answer to the leak question makes sense, and, if there were a leak/sucking air the motor would "stumble" under acceleration.

I will check the voltage going to the fuel pump to insure consistence power is supplied shortly.

I will need to buy press tester (Gino $50, is there a cheaper one) that hurts because I purchased the Quadzilla Recon to monitor fuel, egt & boast. Will need to contact Quadzilla again, I just returned their XZT setup because it melted/caught fire under my dash.

Here is the twist, pressure remained constant before I installed the new vp. Only drove ~500 miles after installing the new lift pump due to hard start problems. But during this time fuel pressures were 17+. What does this mean regarding the old vp? The banjo bolt was replaced on the old vp so that is eliminated. Another blockage in the old vp that would cause high pressures? Only problem was hard hot starts, performance was very good but didn’t run long enough to check mileage. (Sunday morning 2 cups of coffee, no food, maybe I am over thinking this and should check the new lift pump and pre filter)

Any thoughts?

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forgot to mention, power wire goes directly to battery, relay connected to stock pump wire.
With the new vp it starts and runs well but have only driven 50 miles since install

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started tracing the wires with my meter and all of a sudden everything works perfect. go figure

 

With your last statement there it makes me think you have a bad connection someplace. Check all the connections and put some dilithium grease in the connectors just for extra insurance.

 

Thanks for all the info

Just drove ~150 miles last 2 days and truck is running great. New VP feels responsive and new lift pump keeps pressure 17-19, even at WOT. Topped off the tank and will track milage. Feels great driving my truck.

Was getting 18-21 (depending on traffic) on the freeway before pump went out. Hope the good mpg remain.

 

Follow up
New VP is great, new lift pump keeps great pressure. Looking back at the problems, I am disappointed with the Quadzilla Recon. The recon gauge was purchased months ago and did not display correct fuel pressures (quadzilla put out a faulty product, will not deal with them again after experincing their customer service, they kept asking for more money). Should have replaced the lift pump long ago it might have saved the VP.
Regarding the VP, again truck works great. Just finished a 400 mile trip, kept my foot lite and got 21.6 mpg at 65-75mph. Changing the VP was not difficult.
Thanks to all