lberch

Finally replaced the VP44 and all associated codes and dead pedal are gone. Also installed an Airdog replacement pump and now fuel pressure at idle is 15, normal driving 12 and WOT it still drops to around 6. Guess I will have to upgrade the supply side hoses to 1/2". While I was deep into the fuel system I decide to replace the connector tube O-rings. One of the six looked a little beat up but not much. I did this because part of my VP44 troubleshooting symptoms was eventually an extended crank start on an incline. I still have an extended crank first start of the day when it sits over night. Never had this issue ever before. I have turned the truck nose down last night to see if it makes a difference. I guess I am chasing a small air leak that is allowing fuel to be displaced and the extended crank is needed to clear the air at first start? Any good advise in finding this air leak? Thanks in advance, Leo

So......this AM I checked fuses, grounds, continuity, relays and AC ripple from the alternator as prescribed .05 VAC running with headlights on and Bat+ on alt. and gnd - on alternator housing. then I bought a scan tool and got P0216 Timing error. So cycling the ignition three times without starting never gave me the timing code. I cleared all codes and drove half way home and the truck was fine but reverted to acting back up with P0216 code returning. So it seems I am needing a pump ...... Is there any value in removing the timing piston and seeing if its stuck and maybe get a little more time? If yes can I do it with the pump installed? The cover is staring me right in the face.......? Any input is welcome Leo

I have the DDRP 2011 vintage (small replacement pump installed where the carter was. All other lines and hoses are stock. Understand need an OBII scan reader to reset - thanks Any guidance on the Alternating Current check on out of the alternator?

thanks for the replies No smoke at all not even a puff of black or white not at idle not during dead pedal not any at all yes #2 above is more of a statement than a question.... I drove around for weeks with both a digital volt meter and an analog volt meter connected to the output pin of the APPS. Always a smooth progression from .5v (idle) to 4.5v (wot). When dead pedal occurred voltage still smoothly followed my foot and never jumped or dove or was erratic at all. So that's why I don't think its the APPS I need to pull the battery power this weekend and kill the 0122 code and see what happens. I never have had more than 10 psi fuel pressure going down the road. Not with a brand new carter or when the Fass was new. I hear ya on FP though......my pressure is at the VP not the output of the pump. How do I check if I have AC interference from the alternator? Do I disconnect the alternator and just run on batteries for a short while? I may have a lead on the solenoids over in the UK but yes they would not be an easy acquisition.... thanks for the help guys!

First time poster, appreciate all the info exchanged here. 2001 2500 ETH (six speed) 245HP (I have owned the truck since new - June of 2000) I think the current (subject) VP was installed by me around 2003??? and is the second replacement pump on this engine. I have always changed fuel filters and "check" lift pump pressure with a mechanical gauge which is anywhere from 6 PSI WOT to 12-14 PSI (25 second no start check). I have a FASS DDRP installed (2011), (new overflow valve and fuel drain valve installed recently. So......I am here looking for a little help I have had an intermittent dead pedal about one year now.....It has progressively gotten worse over time (more frequent). About two months ago I had a first time extended crank start maybe 4-5 second delay. Unusual part about this new issue was that it would only have the delayed start in my driveway on a slight up incline. If I turned the truck around (inclined down) it started normal (immediately) and when it was on level ground it also started normally. I continued to drive the truck and decided to replace the fuel filter and check the pressure.....all seemed normal so I did some reading and decided to change the overflow valve and gaskets and tighten the fuel return banjo on the back of the head. All seemed good for a few weeks and my "incline" delayed start issue was gone also. Few more weeks later I started it one morning and it immediately started but oscillated up and down in RPM for a say 10 seconds. Drove the truck and power was really low and dead pedal would come and go as well as now the engine sounds like its "detonating" engine sounds like a bucket of bolts. Engine has a totally different (louder) engine noise than normal. Did some more reading and I have been driving around with a clear hose under my wipers and my mechanical fuel pressure gauge for three weeks now. No air in the system and FP is normal. I even ran new hoses from the bed to the transfer pump and back to 5 gal of fresh diesel in a can and no change. Also thought I may have a bad batch of fuel so I drained the tank and refilled with fresh good fuel and again....no change. The only code it has ever thrown is P0122 APPS. I did the "blue chip" APPS troubleshooting and I am fairly confident its not the APPS. I am starting to believe it is either fuel valve solenoid (between the six distribution valves) or the advance solenoid or the computer (PSG) on top of the VP. I want to believe its the fueling solenoid as I have no timing codes set. But if the PSG commands XX fuel and correspondingly fires the fueling solenoid I don't think its getting any feedback as I don't think it measures flow? The questions I have are: 1. Can the PSG (computer), Fueling solenoid and advance solenoid be individually tested? 2. If the PSG is bad I already know if it gets replaced the pump has to be calibrated on a Bosch EP815 test stand. 3. If I can find and replace either solenoid will I get away without needing calibration? 4. Could it be the timing piston or another mechanical issue inside like a clogged mini screen? This is driving me nuts as I like many, can't stand paying $1,250 for an exchange VP44 Any help or suggestions will be appreciated. Thanks in advance, Leo