Truck is acting up again. Will start perfect when cold after sitting all night. If I drive and get it warm and shut it off, it will not start right away. Spins over good, fuel is at 13 lbs when key turned on. It seems to start better if I hold accelerator pedal half way to floor. Anyone else have this problem? Don't feel like buying new VP44 right after Xmas.

 

Well have you checked for codes?

 

yes they are 1682 and 500 using the odometer

 

Well i may be wrong but i beleive the descripion is "P1682 Charging System Voltage Too Low" I'm not 100% sure on the web site that i found the descrition.
Have you checked your voltmeter while driving?
My alternater died at 132,000 miles.
When was the last time you replaced the batteries?
Bad batteries can act funny sometimes. They can drain the alternater from it's output power. But when you leave them alone for a while you can sometimes get the truck to turn over. I've seen them do all sorts of things.
I have 3 friends that have replaced batteries in the last 2 weeks. Mostly because of cold weather. There's a few options to look at. I may be wrong about the code.

 

I had to change altenator a few months back, maybe the codes did not clear out after having the batteries disconnected.

 

What about the other questions? What's your Voltmeter reading while driving? Battery's?
I don't know the description on code 500.
If you generated any codes from your old alternater failure they should have cleared by now. I'm thinking that what you see is current.
I'm surprised nobody else has spoke up in this thread.

 

It's the holidays,people are busy. Volt reading is a little over 14, Batterys are strong and all cables are clean and tight. I pulled the plug off the back of injector pump as someone told me maybe it was getting corroded, but it was clean with a little film of clear grease looking substance. I was going to install a one way valve between filter and VP44 to keep a head pressure. When lift pump buzzes at first pressure goes to 13 lbs than right to zero as soon as pump stops buzzing. Local diesel shop figured there should be a minimum of 10 lbs while starting .

 

My FASS pump does the same thing and the truck starts cold or hot all the time. 0 psi at start. immediate 15 psi when running. I don't think thats your problem. However i don't think it would hurt.


Does anybody know code 500?

 

Well check this website http://www.obd-codes.com/trouble_cod...alfunction.php
Not sure if a speed sensor will affect starting the truck.

 

You don't need Fuel Pressure for the engine while it is starting. Your truck will start easier without pressure going to it while cranking over. Your LP should prime, then shut off, crank engine and once started your LP will start again.

 

Diesel shop just said that fuel cap might be not venting, I will try and loosen cap and run it. Doesn't sound like it is plugged though as it would probably surge on highway.

 

you should get a quick bump of fuel and then pressure should drop to 0-2ish psi. once the truck is done cranking....started or not, the lp shoudl run up to its operating psi. if it is not running it will stop pumping in about 30 seconds.

as for your hard starting problem when warm, have a couple gallons of cold water handy next time you shut it down. run the water on the vp44. if your truck starts good after you cool the pump, well......$$$$

as for the check valve, forget it, you are going to do more harm than good.

 

you can try this test it will tell you if your vp is going bad..

when its hot, unplug the lift pump and try to start it.if it starts shut it off asap.as long as you dont have an air leak the vp will pull fuel but it will hurt the pump if run very long this way . If it starts your diaphram in the vp is going out! It could go real soon or as in my case go 35000 miles hope this helps

 

JUst a long shot, but what if my valve clearances are getting too close and when engine warms up the valves are not seating fully when hot while I am trying to start it?. Truck has 469000 kms and I have no idea if valves have ever been set. I bought it used a year ago.

 

Truck did it again this morning. Started perfect when cold -13C, not plugged in fast idle worked everything was good. I drove to the tire shop straight into the bay and after tires were installed ,,1 hour,,the sucker would not fire. It spun good and fast, nothing no smoke nothing. So in desperation as everyone was watching me I pushed fuel pedal to floor and it started with a roar, straight pipe sounds good in doors. I am at a loss trying to fugyre this out. I would hate to put a new VP44 on and find out that was not the problem.