I need some suggestions

ctdiesel99

ctdiesel99

Comp Diesel Sponsor
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Nov 23, 2008
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So i put this so vp44 on brand new about 2 and a half years ago, at the same time i put on a fass hpfp 95 pump with draw straw and lines. truck has ran perfect ever since. For the last 3 months it's been hard to start. It'll sit there and crank for 45 seconds or so and finally turn over. And when it does finally start i have to put the pedal to the floor until it finallys starts. I dont have a fuel pressure gauge on the truck but i can hear the pump come on for about 5 seconds when i turn the key on, and if i bump the starter it will run for 30 seconds, so i dont think it's the fass but im not sure. I changed the overflow valve out and that didnt help any. It acts as if there is air gettin into the system somehow but i have no clue where or where to start lookin. I have a feeling if the inside of the pump was going bad, it would have quit on me, but this hard start issue has been going on for 3 months if not a little longer. I'm bout to rip my damn hair out just thinkin about it, thought about rippin the entire fuel system out and replacing all fittings and lines, that'd be a lot cheaper than a vp but would rather now go that route just yet
 
First get a gauge, even if its a cheap temp. Seeing what the pump is doing pressure and bleed-off wise if much better then hearing it and guessing. Also try parking nose down on a slope, see if it helps. If you got a leak that usually helps.
 
well if i park nose down hill it usually helps a little. but i still have to give it throttle and about 30 seconds of cranking before it finally starts. I'm going to see if i can get a hold of a smarty to check for codes, but i'm really leaning toward a small air leak somewhere, just have to find the little booger. i guess i'll start by removing the fuel filter housing and if i cant find anything there i'll take the bed off. I'm all ears if anyone else has any suggestions
 
yes it's fuel related. i replaced the cam sensor back in december and this isnt giving the same symptoms. it's like its not getting enough fuel to start, but when i mash the fuel pedal to the floor you can hear it turn over faster and sounds like it's getting more fuel then she'll finally fire up.
 
Is it only when the truck is cold? or first start of the day?
 
Unplug the fass and see if it starts up quicker. IF it does you might be looking at a new vp-44 in your future. There is a thrust plate that can fracture and cause that, so I have been told. If it starts pretty good if you try to start it right back up after shutting it off, and then not so much after 10-20 min. And it progressively gets harder the longer it sits, then it most likely is a connector tube o-ring. When they crack, it allows air to get into the system which can cause it to loose prime.

Zach
 
it's starts up perfect in the morning. I mow and landscape for a living so i usually turn my truck off and on quite a bit throughtout the day. After i start it in the morning, every other start from then on out is a hard start just about. I have no other symptoms of it being the vp other than the hard start issue, no dead pedal, no loss of power, just this hard start, and it's been going on now for over three months, that's the only reason i dont think its the pump.
 
Like zach said unplug the fass and try and start it if it starts fine sorry to say its your vp
 
my dads 98 did the same thing as what youre saying. turned out to be the vp...
 
so you all are tellin me to unplug the fass and start the truck with no fuel pump at all?? wouldnt that be bad for it? and if it does start with no fuel pump, why does that mean the vp is shot? just trying to find the reasoning, not tryin to question your alls smartsLOL
 
Got Me Wondering To?

ctdiesel99 said:
so you all are tellin me to unplug the fass and start the truck with no fuel pump at all?? wouldnt that be bad for it? and if it does start with no fuel pump, why does that mean the vp is shot? just trying to find the reasoning, not tryin to question your alls smartsLOL
Click to expand...

I have the same question after reading the suggestions to unplug the fueling unit??
 
Zach says thrust plate, I was told diaphragm. Either way its common for older VP's after getting a Fass or Airdog to not be able to handle the increased flow and pressure and they have a hard start. Supposedly only earlier VP's had a thinner plate/diaphragm and in 200 they received a thicker one.
This can be checked by removing the relay or fuse for the Fass and trying to start it. If it fires shut it off or plug the relay/fuse back in fast. This is one of the VP deaths that won't give a code and once started runs fine. I lived with it for several years by installing a Hobbs switch on the oil filter boss that didn't energize the Fass until the Hobbs saw oil pressure. I finally replaced it when I had to carry ether. A side note, make sure you disconnect the relays for the grid heathers on the drivers fender before using ether.
 
Im having hard start problems on a customers truck, Tested the lift pump, at frist no fuel pressure, then got 3 psi, check again and got 15 psi, then tested it while cranking in when back to 0 in stayed there. Order a new Fass direct replacement pump. Now on the outlet side of the filter housing it has 23psi. Truck was still hard to start. So I figured it was the Vp44 put a II stock Vp44 back on bleed system in truck runs, but still has hard starts after sitting and has reached running temps. The ECM was reflashed in 2002. Truck is bone stock beside bullydog exhaust in S&B intake. I cant find any leaks where air would be getting in the system. I have read that to much fuel pressure can make one hard to start. Have you guys ran in to that before.
 
Just thought I would throw this out there:

When the relay on my FASS went out, the truck WOULD NOT RUN. I could barely get the thing started.

I would personally just bypass the FASS and see what happens (and unhook the FASS, of course). Some trucks may have no issue pulling fuel through the FASS, but I'm telling you from experience that it was not the case with mine.
 
The truck run's good when cold but once it up to running temps with the new Vp44 and fass factory direct lift pump it starts to spit and spudder. Let the truck cool down in it run fine but still hard to start. Truck has 248k on it. Im at a lose on this. No air leaking in that i can tell, everyting is dry.
 
well i've just been dealin with the hard start issue the last week or two and the truck finally died on me today headin home from my grandparents. just lost all throttle and it slowly idled down and died. i immediately started it right back up and it ran but was rough as hell and wouldnt do anything when i tried to rev it up, then it just died again. When i went to bump the starter to let the fass run, it wouldnt run at all. im thinkin i blew a relay or something, but i guess i'll look into it tomorrow.
 
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