Attention: TDR Forum Junkies I have a situation here that is against the book. The Dodge manual states that my 2002 Ram stock lift pump, at start-up, is suppose to put out 7 psi. Which, understandably is to allow the engine to start easier. After the engine is started, the pressure is to be no less than 10 psi at idle.
Welllllll, the fuel pressure in the start-up mode is 10 psi, not 7. After starting the engine I get a maximum of 8. 5 to 9 psi at idle. Driving speeds (no load)vary on the average between 6 & 7 psi. WOT is 3-4 psi.
I changed my fuel filter when I bought the truck at 42K and now have 49K. My manual pressure gauge is connected to the fuel system with a 1/4 "ID fuel line. This connection is at the Schrader valve of the VP44. The previous owner in Canada put on 42K miles, of which 98% were highway towing miles of an unknown weight trailer. Unknown if this is the original LP. If looks could tell, it probably is.
I haven't noticed any loss in power since I've owned the truck. Soooooo, with the information that I stated, can anyone tell me: (1). Why the reversal in pressure readings for idle and start-up and (2) even though these reading have been consistant for the last 6+K miles with some towing of a light trailer and a couple 500 mile 12K pound tows, am I in danger of harming my IP even though I have no indication of harm so far? And lastly, could this be a sign that a new or better pump is way overdue or should I try a different gauge or do both?
Welllllll, the fuel pressure in the start-up mode is 10 psi, not 7. After starting the engine I get a maximum of 8. 5 to 9 psi at idle. Driving speeds (no load)vary on the average between 6 & 7 psi. WOT is 3-4 psi.
I changed my fuel filter when I bought the truck at 42K and now have 49K. My manual pressure gauge is connected to the fuel system with a 1/4 "ID fuel line. This connection is at the Schrader valve of the VP44. The previous owner in Canada put on 42K miles, of which 98% were highway towing miles of an unknown weight trailer. Unknown if this is the original LP. If looks could tell, it probably is.
I haven't noticed any loss in power since I've owned the truck. Soooooo, with the information that I stated, can anyone tell me: (1). Why the reversal in pressure readings for idle and start-up and (2) even though these reading have been consistant for the last 6+K miles with some towing of a light trailer and a couple 500 mile 12K pound tows, am I in danger of harming my IP even though I have no indication of harm so far? And lastly, could this be a sign that a new or better pump is way overdue or should I try a different gauge or do both?
