fp drop

[NLeach]

HI. Driving home from a small trip the fp went from 9. 5 to 7. 5 and held there for a bit,it happened at idle and stayed through the mile home. I restarted the truck and the pressure was normal(for my truck) at 9. 5. Checked for leaks,none. I am leaving saturday to move cross country. Do I need to worry about this or is this something normal and will pass?

 

[rbattelle]

Sudden variations are not usually normal, but my aftermarket system does fluctuate a couple pounds based on ambient conditions.

With fuel pressures below 10psi, I'm assuming you've still got the stock in-tank pump. I wouldn't start panicking, and I wouldn't worry about it for your drive cross-country. Just keep an eye on the pressure for now.

Bring a spare fuel filter with you.

Ryan

 

[CStraface]

I just got back to CA from TX. Along the way, my Rail Pressure gauge was all over the place. At times I would be driving at 70 MPH and the RP would be at 15K, then 5 minutes later it would jump up to a constant 25K. If I pulled over and let the truck chill for a few minutes, the RP would return to normal 15K-20K while driving at 70 MPH, but after another 10 min of driving it would jump back up to 25K. I am thinking that I could have picked up some bad fuel or that I have algae in the tank or system somewhere, as my Walbro has a very loud whine now (never did before). Fuel pressure is still 14-16, but should be at about 19. At least, that's where it was when I did the GDP install. I am going to run some algaecide and then change both filters and see if things change. Anyone know what brand algaecide to run?



I wouldn't worry too much about the flucuation. But like previously stated, get an extra filter, or maybe just change your filter now, and see if that helps.

 

[NLeach]

Changed the filter already to the 5 micron,about 1k miles ago so I dont think the filter would cause that all of a sudden pressure drop,and just for that little bit. I got spare 7 and 5 micron filters and some stanadyne so I should be all set. Temps were higher than I have seen here so far with this truck(80) so maybe that has something to do with it. Oh well. Wish me luck.

 

[NLeach]

Trip over. FP never dropped below 7. 5 over the biggest hills,and never saw under 9. 5 at idle,seems it was just that one time.