Last night I updated the adrenaline with the newest version of the dyno tune. So today I was driving home and decided to roll a little coal on the city folks, turned it on level 10 and hardly got any smoke or power at all. I turned it back to stock and laid into it, boost and everything was normal so it doesn't feel like its in limp mode and no codes were thrown. When I got home I killed the engine and then started it again about 15 minutes later because I've heard warm hard to start issues are related to the VP. It fired up like normal but I think I am going to put another tune on the ADR and check ADR connections under the hood and see what happens. Questions? Comments? -

cummins24's Sig:

'99 Ram 2500 5spd, adrenaline/pulse, BHAF, recon super whites, silencer ring MIA, muffler MIA, home made FP gauge, c-power shift knob, Xplod's all the way around, 2 10" Kenwood subs
53 block

Try the new comp tune -

lukesdiesel's Sig:

Diesel Dawgs Performance Apparel

01 Cummins HO 2500 Xcab 4X4 , NV5600, Adrenaline/Pulse, BHAF, Airtex LP, 2" Lift, Traction Bars, Goose Neck, 4" Exhaust, Jacobs Exhaust Brake, 285 BFG AT KO, BD Steering Box Stablizer
316/716 Mustang Dyno

Click Here for Top Diesel Site

This morning the dyno tune worked fine it just happened on my way home. I had the older version of the comp tune of it before and loved it so I'll probably switch back

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I ran into town a little while ago and everything ran normal. I'm not sure what the deal was but I am still going to download a new tune and probably update the pulse for custom tuning -

You should be go to go -

I'm no expert but I sweated through diagnosing/deciding a few months ago whether or not my VP44 was failing - 240,000 on the original. Based on all I learned - I concluded my VP44 was bad. The replacement (Blue Chip Diesel) cured the problem and improved performance and fuel mileage. Based on your description of the problem it seems unlikely you have a VP44 failure. -

Sounds to me like your lift pump is goin. I don't see any high pressure LP or fueling mods in your signature. If your runnin that box with the stock fueling system your starving your VP and it won;t last long turned up. Your literally runnin the VP dry if this is the case. -

Uncle Bubba's Sig:

99 Quad Cab, 4wd, Drag Comp W/Pump Wire & Boost Elbow installed, K&N Air Canon, MBRP exhaust, Belt Drive Lift Pump and bottom Bulkhead feed from the tank, Isspro EV Pyrometer, Boost Gauge, Fuel Pressure Gauge, DT Pro Fab Trac Bar, South Bend 13-1.25 Con O Clutch, Ranch Hand Bumper, Borgeson Steering Shaft, Black Silicone Boots, 2" Lift Soft Ride Front Coils, Solenoid High Idle Kit, Bilstein 5100 HD Shocks, Rickson 19.5 Wheels w/Hancoock Rubber, HD Maxx Link Sway Bar Links, Superlift dual front stabilizer, EGR Brakes Front and Back, RV275 Injector's, Blue Chip VP44, Prodigy brake controller, B&W Gooseneck hitch and more I can't remember right now. Not to mention more to come I'm sure.
374.2/846.7 at 30psi

From what I have found, the Adrenaline can cause too much duty cycle at high rpm. This in effect alters the timing, fuel volume and even fuel pressure.

This is why most trucks make more power on a lower level than on PL9 or PL10.

Also, lift pump pressure is not the cause. I know this as I have run over 40 psi into the VP44 through a modified 14mm inlet with no changes in power.

Dave -

Fishin2Deep4U's Sig:

'02 Dodge CTD - Mostly stock.

Vulcan Performance

Sales - Dave Conrad

Direct line 503-970-6712


Fight N Fish Guide Service

40 PSI into a VP??? That's looking for trouble! There is a valve that is set at 14 PSI (I think) that bleeds off the excess fuel, but most often the truck will have starting issues with pressures in the 20s.

I'm sure that too much pressure is not going to provide any additional performance over what you would normally get with a truck that is tuned properly; however, a lift pump that is supplying a less than adequate amount of fuel to the VP is certainly going to provide performance issues ... been there, done that! I noticed a remarkable difference in performance when I replaced my dead lift pump ... even more when I replaced my DEAD VP44 a few months later. Listen to what has been said before and check your fuel delivery system. A fuel pressure gauge can save you a lot of heartache and money! -

piperca's Sig:

1999 2500 SLT, QC, LB, 2WD, Auto, 4:10's, VA V5, RV275, S&B Intake, AFS Big Dog Fuel System, Vulcan Draw Straw, Isspro Fuel Pressure, Westach Boost/EGT Combo, CSS front springs 2" over-stock, KYB MonoMax, DTT Noise Filter, "Dreaded 53 Block", New VP44 @ 135k.

Here Here! -

Mopar1973Man's Sig:

2002 Dodge Cummins - Michael Nelson

I second that one, you dont want anything over 25psi and anything less then 7 and thats from cummins and bosch themselves, anything more then 25 for a long period of time will reputure seals, if youre just doing a sled pull of strip run a few times a year and dont do any daily driving, you'll be fine at 40 psi but make sure you are ready to swap VP44s when it burns up. -

dukeboy_318's Sig:

99 Dodge Ram 2500 4x4 Cummins, 5spd with south bend CON OFE,
150 DDP horse injectors, Fram Boost intake, Edge Juice with attitude, 150 gph fass fuel pump, Ranchhand winch bumpers, front and rear, 2 inch leveling kit, New Kenwood head unit and speakers, 305/75/16 BFG All-terrain KOs, 6 in hella off road lights, Procomp silver mechanical guages. 5/8 drawstraw III, 1/2 inch lines to the fass for now.
TST dyno results- 463.8 hp and 1076.3 ft lbs
Recruiter/member- Blowing Smoke Gang

Actually straight out of Dodge's FSM is 10 PSI minimum...



You can download the FSM books here...
www.pdftown.com -

The pressures noted are for the purpose of lift pump diagnosis.

I can't count the number of times I have been told that high inlet pressures are rupturing seals, blowing out the pump, causing extra wear, even costing horsepower.

After 60,000+ trouble free miles with no less than 37 PSI EVER and 45-46 at idle, I have to lose economy, power or have to replace a pump. I haven't even thrown a code. And since I had been told about the negative effects, we replaced the cam in a bone stock '02 and ran it exactly the same way. Only 84K on that pump....TROUBLE FREE.

It's not that anyone is wrong, but there is clearly more than one way to do things and the hearsay from Cummins, Bosch or whomever appears to be second, third or more hand.

I am still looking for one of these blown out seals. But if I only get 100K out of this pump, I'll be satisfied.

Just for the purpose of info regarding the overflow. I still get 35 psi WOT box on kill with 200+ HP injectors with NO OVERFLOW INSTALLED! This is with a straight fitting. Makes starting near impossible, but it does work and maintain pressure. I would not run it long term this way as it is not good to not have the back pressure on the system. The truth is, there are far more restrictions on the front of the pump than some would expect.

As far as starting issues, this is an electric pump thing. I don't start making pressure until the engine begins to spin. So I am started long before it's at 20psi and when it kicks over, I go to 45 psi instantly.

I have built a bypass regulator but chose to not install it as I would have so many problems in the current configuration. At least I wanted to see if I was going to have issues. Not one yet.

Dave -

Wow! 37-46 PSI of fuel pressure...

Dang I thought for sure is would blow out a seal or rip the diaphram inside... But made this far without problems. I wonder how many others can follow this path without blowing up a pump os such?

Me... I've been keeping it between 10-20 PSI and I've got 86K miles on my pump and still going strong. Like you said if the pump died at 100K miles... So be it... -

mines beeng running over 214k with a fass 150 installed at 60k producing 16psi wide open throttle with my 150s and the juice -

Hmmmm....thats interesting with that high of pressure....well if it works and is still working so be it!... -

TheNatural31's Sig:

01 2500 4x4..NV45..BD-Short Shift..ADR/Pulse..AD-150..BHAF..5"TBE..Dipricols..ITW: DDP's,64/71,HTT Mani The Best = Holland Court Diesel & Coaltrain