Hello. So today I drove my truck all morning no problems. Let it sit for an hour came back to drive it and my fuel pressure gauge is saying 75? But the gauge is all over the place from 70-75. Normally I see a minimum of 65 max of 70. While accelerating it went around 68 or so. I have isspro ev2 gauges and they are maybe a month or 2 old. My question is should I be conserned with 75 psi? I thought I read a while back between 55-70 was good but I'm over that mark now so I'm a bit paranoid to drive it. And my fuel is down to a quarter tank I'm also running an edge evolution program on race mode. Another question. My edge beeps at me when it gets cold at night and I have to unplug it and plug it back in for it to work. This truck just turned over to 120k. I find it hard to believe something is wrong but I want to be safe than sorry. Any help is greatly appreciated. Thanks

 

Many of us have had issues with the Isspro fuel sensor. I would just keep an eye on it, and if it starts jumping around get another sensor. They have a warranty.
Mine read 75 PSI from new, after a while it pegged at 100+, I installed a new sensor and now its reading a normal 60 psi.
A good way to check it is to turn on the key and let the fuel pump cycle and shut off, open the drain valve on the bowl, and see if the gauge zeros.
Mine was reading 50 psi with no fuel pressure.

 

Wow ok I was thinking it was the gauge also but didnt want to risk it. I also have the pyrometer isspro ev2 gauge and that thing never zeros out after I shut the truck off. It always lays around 1-200 even after sitting for a whole night. Are these just junk gauges? Thanks a lot for the help!

 

There is a filtered side of the fuel bowl (close to the passenger VC) and an unfiltered side (closer to driver side VC). Use the filtered side, the raw fuel will plug the sensor and cause it to fail. Besides, the filtered side is the pressure your injectors see... so you know when the filter is an issue.

 

I'm on my third sensor. Spoke with Isspro after the second failure- they source the sensors from another company, still made in USA though. Sounds like the issue is with the diaphragm in the sensor. It will tear and read high and eventually peg the gauge. My second sensor jumped by 25 psi overnight. I have another gauge I swap in to verify a bad sensor. You might track down a mechanical gauge and make sure it's the sensor causing the high pressure reading. If it is a bad sensor talk to the company you bought it from about getting a new one. Isspro is working with the manufacturer to resolve the issue. Regarding the pyro, maybe call Isspro and discuss that with them.

 

I went threw many oil pressure sensors on my old drag car. Turns out some sensors don't like to be shaken violently. After lots of research I found that many motors like a diesel are to abusive to some sensors (shakes them to death). What needs to be done to save the sensor is a remote mount. A soft (braided or hose) line needs to be ran from the motor to the sensor, the sensor should be zip tied or screwed off on the firewall or fender liner or the like.

 

Mine is on the pre filter side(driver side).

 

I will plug in my mechanical gauge and let you know what I find. That's a good point I did not think of. But as much as I laid for these gauges I did not expect the sensor to be that weak!

 

I see your point. Tht explains why my Chrysler 440 can't keep an oil sensor in it! Good idea though I'll have to do that once I verify the sensor is shot and get a new one. Thanks a lot for the idea.

 

Anybody seen Joe?
Good tip Tugly on the filtered side vs. unfiltered. Mine is unfiltered, thought that would help me know when filter getting dirty. But also run an inline pre pump filter.

 

The unfiltered side will see the high-pressure side of a clogged filter in the bowl. I'm not sure if that contributes to what you were saying.

 

Yeah, I guess it's a matter of watching for a spike in psi or a drop in psi. Not worried about any debris due to the inline filter.

 

Ah... you won't see a spike. The "dirty" side is the one with the pressure regulator.

 

Damn!!!! You would be correct.