High Fuel pressure reading

[retirednak]

I've had my airdog on for a few months and less then 3000 miles with 0 issues till yesterday. Restarted it after a 20 min break and noticed my fuel pressure gauge at 38 psi and when going down the road it shows almost 40 psi. At a stop light I thought I felt the engine stumble a couple times,on the 8 mile trip home nothing out of the ordinary other then the high pressure reading gauge. Rail pressure was normal,Smarty was turned down for winter,got home and took Smarty off. When the engine is off,the fuel pressure gauge rests at 40 psi rather then 0. I'm not sure where to start other then with a mechanical gauge to see if I'm getting a false reading. I've got to drive 10 miles to get a gauge,if the gauge is correct will I damage anything by driving with high pressure? If the gauge is correct,where do I go from here? Could a plugged filter cause this?

 

[retirednak]

Come on fellas,help a guy out. Need to know if I can drive with 38-40 psi without hurting anything.

 

[JJPage]

That much pressure to the CP3 is not good, but if the gauge is setting at 40# with the engine not running then the gauge is not correct. 40# of fuel pressure might pop the lid off the fuel filter housing.

 

[retirednak]

Thank you,I was sweating bullets on the drive home hoping nothing $$$ was gonna break.

 

[JJPage]

I believe 20# pounds is the maximum pressure the CP3 should see, and that may be pressing it. What kind of gauge are you using and where is it reading from?

 

[EDankievitch]

I had used the pink potable antifreeze in the gauage line between the isolator and the gauage, Last winter it was cold enough to cause the antifreeze to slush up I was getting really high readings and it would not read zero when the key was off. It stayed like that all winter once the spring thaw came all went back to normal.

 

[retirednak]

Sorry for not getting back to you all sooner,got bit by a Brown recluse spider and that little SOB has me all jacked up. I'm running the Factory match Auto Meter gauges from Genosgarage.com with the exception of the fuel pressure gauge,its a Isspro. I talked with Genos and was told when a gauge pegs out its usually a ground problem,they are e-mailing me trouble shooting guide/instructions. Genos is great and know how to take care of their customers! My mechanic/friend did the install for me and followed the distructions. The ground is making a bit of sense to me,every now and again the gauge flutters a bit. I will be going back over to my mechanic/friends place and have him check the grounds ect while he changes the rocker box gasket.

EDankievitch,I'm afraid you lost me about using the pink antifreeze in the gauge line. My truck sits in the garage 95% of the time,usually 3-4 days in a row before heading out. We haven't had much of a winter yet,keep waiting for a big dump of snow or shrink up your package cold. I will pass this on,thanks for the suggestion.