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LOL! Now it is hard starting

flman
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flman

flman

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Seems that Fass feeds too much pressure and the VP44 does not like it. The pump is controlled through a relay tied into the stock pump to supply pilot voltage to the relay coil, I guess just that split second that it puts pressure to the pump is enough to screw it up. If I wait, for the pressure to drop, it will start OK. I was thinking of putting a time delay relay on the pump? http://www.primelec.com/Electronic-Components/Relays/AGASTAT-12-Volt-On-Delay-p7886012.html

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ISX

ISX

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I think I spent a few months playing with just that very time delay relay :lol3: I don't see how having pressure would mess up it's starting ability though. Would make it start better if anything, I would think. I wonder if it feeds it so much pressure as to open the overflow and that does something that makes it start worse. Hmmmmm

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guesswho512

guesswho512

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i've read about this in other forums...most people agree that a diaphram inside the pump is ruptured. this is usually caused by running low fuel pressure to the VP44i believe there is suppose to be a delay, or something when you turn the key...err i'm not wording this right.alot of people get by with a delay. but high pressures(above 20) usually have people getting hard to start situations. if the diafram is ruptured than most i have read crank at 7-8psi then run 15psi

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flman

flman

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The truck does not start normal, cold or hot, plus it still will not run like it used to, on the highway, at cruising speed it still has the dead pedal going on as well, and I think it could run better at lower speeds as well. These are pretty much 2 classic symptoms of the computer on top of the VP44 going bad. I think it is time for Blue Chip to send me another VP44, he says he has seen those computers fail very early in the life of a remanufactured VP44.

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flman

flman

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Well, today it started fine all day, so I guess I wont be needing the time delay, and that should pretty much rule out the warranty voiding diaphragm, but I did contact Blue Chip to get another 16X pump sent out. I will let you all know the outcome in a few days after I get it and make the swap out. At least I know the new VP44 is gonna love that Fass, thanks to all of you at Mopar1973Man.

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flman

flman

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Now, I have 2 more symptoms, I decided big blue is going to stay in the shop until I get the new pump installed. I am not paying a heavy truck tow bill. Now, when I started it yesterday it had a rough idle, and today I started and it stalled, restarted it, hard starting and rough idle, so I threw all the tools I needed into the Sprinter, and went to work. Now I got 4 classic symptoms of the VP44 going bad, the only thing left is: truck dies going down the road, no start, high speed high load miss, and doggy at take off. So I got 4 out of 8 of the common symptoms.

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