what fuel pressure are you seeing?

[lmills]

Just curious what fuel pressure you all are seeing. I have the Diesel Dynamics pusher pump kit and it doesn't seem to be keeping up to the task . Every since the turbo install I noticed the truck felt low on power on the top end around 2750-3000 RPM. So after poking around and making a lot of phones calls. Mark at TST told me to check my fuel pressure at WOT and drive pressure. Well, I found the fuel pressure was being sucked down to 2-1/2 psi before the filter right around the time I feel it flatten out. So I am almost certain it is fuel related. After filter I am sure I probably have close to 0 pressure. I can actually feel the truck surge at that point and you can watch the fuel pressure needle bounce from 2-1/2 to 3-1/2 psi. Almost like it is keeping up in spurts. Has anyone else had an experience like this? I want to try to get all the bugs worked out before we hit the dyno in 4 weeks. Thanks for any inut.

 

[Jengle]

Lloyd,

I have mine post filter, and see about 7 most of the time. Full throttle runs will pull it down to 5, and that's as low as I have seen it, yet. Of course, I am still stock at this point. Funny that you see it that low pre filter. And that's with the pusher pump.

 

[lmills]

Yeh, I spoke with the guys at Diesel Dynamics about the pressures. The first questin was "what are you running on the truck?" The only word I got out was TST. They said it was not suitable for use with the TST. So if anyone is looking for a good pusher pump thats only been used for about 3-4 weeks, shoot me a PM. I am probably going to upgrade to an aeromotive fuel pump. I need more pressure.

 

[BCarmicle]

I've got mixed results with my DD pusher pump. Sometimes I start the truck and only see 6-7lbs @ idle and the needle doesn't move even at WOT. Other times I can start up and the gauge reads 10lbs. I've noticed that sometimes the longer I drive increases the fuel pressure up to as high as 15lbs. I have no idea why there would be variances like this. Keith said that their pusher pump is rated for no higher than 500hp. Anybody have any input?

 

[lmills]

I have the same issues with the low pressures at times when I am priming the system. I thought maybe it was just a fluke, now I am really wondering. I think they need to find a better pump. You can actually hear the pump making a different noise when it acts like it is struggling to push 6-7 psi on start up. Then the tone changes and the pressure jumps up to 14-15 psi. They said I should not allow the pressure to get lower than 7 psi. So the pump is definitely on it's way out.

 

[lmills]

Well BCarmicle, you are obviously running the same if not more HP than me, so what are your pressure at WOT(in lock up against rev limiter)? And did you take the factory lift pump off like the instructions said to? Or did you leave it on?

 

[Floor It]

I have the FASS fuel system on mine and it wont suck down below 12 psi at the injection pump.



John

 

[BCarmicle]

lmills,

My pressure hasn't pulled below 6-7lbs. @WOT. If the gauge is reading 15lbs(which is rare) then it won't pulled down below 12-13lbs. I took the stock lift pump off as instructed. I may end up going to a FASS or a RASP if I can't get anything more out of this pump.



Brandon

 

[lmills]

I should have the aeromotive on by this weekend, if the weather holds out. Hopefully I will get some better pressure with it.

 

[BCarmicle]

Who makes this aeromotive system? I haven't heard of it. How much power is it suppose to hold? Keep us posted on your results.

 

[lmills]

aeromotive is the maker. this one is 150 gph and 20 psi

 

[Gypsyman]

Yeh, I spoke with the guys at Diesel Dynamics about the pressures. The first questin was "what are you running on the truck?" The only word I got out was TST. They said it was not suitable for use with the TST.

It cracks me up when vendors immediately blame the TST for any problems with thier systems. What brand of pump comes with the DD kit?



-Richard

 

[lmills]

Just one of the Carter HP pumps. I was also told when I called them and inquired about the set up that it was not the same pump that people used for pushers on the 24 vlave motors. However when the box arrived and I opened it, it was just a plain ole carter pump. Nothing different.

 

[Jengle]

Lloyd, funny they said you shouldn't be below 7psi, when that's what my stock truck has always delivered. And since it pulls down to 5 stock, that's apparently enough for Dodge to accept, or they would have boosted it at the factory. Why not try the pump that TST is running on thier 3rd gen, the Holley pump? When I talked to them at Muncie, they said it gave them a consistent 15psi. I don't recall whether it was the blue or the red model, there were two they had there, but you could talk to them about it, and see what they have to say.

 

[mattymac]

It cracks me up when vendors immediately blame the TST for any problems with thier systems. What brand of pump comes with the DD kit?



-Richard

They advertize their pump for 500+ hp aplications.

 

[KLockliear]

Brandon, what fuel pressure gauge do you have? I have seen what you describe when there is air in the mechanical isolator setups. If the pump is working right, it should come straight up to the mid 'teens.



Lmills, the pump we sell for the 3G trucks is different than the pump for the earlier trucks.



Gypsyman, we don't blame the TST for anything. We simply state that we don't use that box, and don't test our stuff to work with it. Our setups work well if you use what we prescribe. If you want to use different boxes, etc, then you are on your own as far as knowing what will work with what... unless that vendor has tested his product with ours.

 

[lmills]

Lmills, the pump we sell for the 3G trucks is different than the pump for the earlier trucks.

How do you mean that? I am not going to try to dispute that if you are talking about a specific product that you sell as a pusher kit for the 2nd gen trucks, but in my past experience most people in the 2nd generation forum are running this same pump as a pusher pump.

 

[lmills]

Lloyd, funny they said you shouldn't be below 7psi, when that's what my stock truck has always delivered. And since it pulls down to 5 stock, that's apparently enough for Dodge to accept, or they would have boosted it at the factory. Why not try the pump that TST is running on thier 3rd gen, the Holley pump? When I talked to them at Muncie, they said it gave them a consistent 15psi. I don't recall whether it was the blue or the red model, there were two they had there, but you could talk to them about it, and see what they have to say.

Actaully Jengle, when I told Mark which pump I was switching to, he told me they are currently testing the aeromotive on theirs also. The holley only lasted a couple months. Which doesn't surprise me in the least. The holley's have never been a great pump for long term use.

 

[KLockliear]

How do you mean that? I am not going to try to dispute that if you are talking about a specific product that you sell as a pusher kit for the 2nd gen trucks, but in my past experience most people in the 2nd generation forum are running this same pump as a pusher pump.

Correct. Our DPPK01 kit for the 98. 5-02 trucks uses a different pump than the DPPK02 kit for the 3G trucks. Not sure what everyone else is doing.

 

[lmills]

OK, I just know that most of the guys in the 2nd gen forum like to run that same carter pump for a pusher set up. That's why when I called and asked about the pump I was a little dissapointed when I received it and found it was the same pump.