the last 3 days when I start my truck for the first time after sitting all night it will crank over for 5sec or so then I stop and crank on it again then it starts. this is not typical for my truck it all ways fires right up. then to day after sitting for 2hrs it did the same thing. any suggestions
Keep the dead or dieing VP talk outa here I dont even want to hear it.

 

I have had many problems and replaced almost everything on these trucks, but the only trouble I have had with starting is that I don't have heater grids on mine anymore. and I know this isn't your problem at this time of year but obviously the colder it is the harder it is to start.

It probably wont help but it is something to check, good luck

 

I said it before and will say it again: aftermarket LPs give too much pressure for cranking. I will be changing mine to reduce pressure when cranking to mimic the behavior of the stock system (without mimicking its low reliability )
-P

 

I have the same problem, ever since I installed my walbro system occasionally it will take a while to start, sometimes it starts right up, seems if it sits more than an hour, but less than 4 or 6 it doesn't like to start right up, in the mornings its fine, and after I leave work, since its been sitting there 10+ hours it starts right up, I got the same response as above, the after market lp's put too much pressure on start up, not sure exactly what to do to go around this other than just keep cranking

 

thanks guys. that was my plan to just keep cranking. I hope it starts this winter.

 

ok how did you wire up your lift pump? i used the power from the power windows. if you turn the key to the run postion and the wait to start goes off(this time of yerar about a half a second lol) do you turn the key to the start postion fast or slow? i know this sounds dumb, but i solved the hard start problem by pausing for about 3 seconds between the run and start postion then starting. my theroy is that this alowas the pressure on the vp to drop, because if i watch my mechanical gauge fp drops to almost 2-3 psi when i hit the starter. no more hard starts......if i hit the starter right away and dont pause fp never drops below 17psi.............ive also had problems with crossover tube orings but you've never had your injectors out this shouldnt be a problem hope this helps and you can understand my jiberish

 

This is what I am doing next - give power to my walbro from a RUN-A22 circuit, which powers only in the "run" key position. I plan to take power before Fuse 2 in the breaker panel. This should stop my hard hot starts.

 

Why not just use a relay and take power from the stock lift pump plug?

 

my truck must have gremlins. it has been fine since the day I posted about this
only time will tell. thanks

 

Air leak? Could be fuel pressure bleeding off and taking a bit to prime again..

 

thats exactly what my mechanic told me.

 

99% of the time its the return fuel line on the back middle of the head. what happens is it looses pressure frome fuel leaking out which causes you to prime the system before it will fire. for some reason it would crank right up when i parked with the nose of my truck facing down hill

 

the last 3 days my truck has started fine but it has also been facing down hill those 3 days. only time will tell.

 

Because as I understand it the ECM cycles the LP during cranking, and with the stock LP this is fine, but with a gerotor style pump it builds pressure too quickly, apparently affects some trucks not others. if you power the relay from the power window circuit the ECM cannot turn the LP on until the engine starts (ECM can't cycle the LP during cranking)

 

The ECM reduces the stock LP duty cycle during cranking. When we trigger a relay from that circuit, we still get the LP to deliver full power blast during cranking because the voltage delivered by the LP circuit is likely enough to trigger the relay. But, the VP44 can work without head pressure, just prolonged exposure to it is bad for it. So I think the best way is to power the non-stock LP from a run-only circuit, while triggering the relay from the stock harness.