yarddog

If you don't have a fuel pressure gauge you need one.

With the Comp on 4 I can pull it down to 0 psi in 4th gear WOT up hill in 2-3 seconds. The highest pressure I've seen is 8-9 at idle. Towing <6000 I can pull it to 0 on setting 3 up hill WOT.

I've got a Walbro 392 on the bench just no time to install it

ironbutt

Yarddog:
I also have that in tank fuel pump. at first the pressure was only 8psi at idle, and Icould pull it down to 2psi by pushing the go peddle. I also added the vulcan big line kit, and after that was on,and the banjo bolts were eliminated. The presure was 9psi at idle,and at WOT i still had 7psi.
It is much better now, with higher fuel pressure. I found that even pulling my 13,500lb 5th wheel trailer, with 20lbs of boost at 2200rpm's the fuel pressure doesn't drop below 7psi.
And yes as you said a fuel pressure gauge is neccessary.Dont drive a 24valve cummins with out one. "Ironbutt"

yarddog

I'm glad to hear the vulcan kit helped. Keep in mind that the VP was designed for 14psi inlet pressure. Any less and you're not doing it any favors. If you had the old style lift pump and were pulling it down to 7psi you'd replace it, right?

The in tank pump is barely adequate for a stock truck pulling heavy loads. If you have a timing only box you're pushing it. If you have extra fueling and no gauge get ready to buy a new VP.

EDIT: In my first post I said I could pull it to 0 in 2-3 seconds on 4. I checked again today and it's actually a lot faster than that. I don't let it get to 0 but judging how fast that needle is moving towards 0 it less than 2 seconds.

sheepboy10

I am buying a edge 5 stage chip. I have a 2001 HO and I've heard alot about the fuel pressure gauge. How high should the Gauge read? All I can find are gauges that go up to 15 PSI is that high enough? Also how important is the boost gauge?

blackdiesel

welcome to DTR and 15 psi gauge is what I'm runing it stays pegged most of the time by my holley blue pusher pump. A 30 psi is better but more pricey boost gauge is really not need but a egt gauge will be need with the comp box.

blackdiesel

dad has an ez and 300 bosh injectors and he can pull it down to 0 with no problem. kinda scary acually

in2gpn

So in reading this why is everyone still running with low FP?????

I have a carter lp in the stock location and a Holley blue by the tank with the BD big line kit and the Edge Comp on 5x5 and the gauage NEVER gets below 15 psi @WOT and 25 psi @ idle.

I've only replaced one VP44 ( warrenty even with the tapped wire )

So me question is why do you guys still run with low FP when you know its gonna kill the injector pump?

yarddog

I don't have any choice until I get time to put in a decent pump. I wanted to warn anyone with this combo and no gauge to be careful. If you're hot roding around town all the time, you can kiss your VP good by

Anything under 13psi is less than the VP should have IMO. That's why I like the Walbro numbers so much. It has enough psi and flow to feed the vp and the return line with no regulator and maintain minimum 15 psi. With a regulator you can get a constant 17+ psi. It moves a lot of fuel in a hurry. Add an inline cooler to that and the mechanical part of your vp should live a long, happy life. The electronics are another story and I haven't figured out what I'm going to do about that yet. I'd like to route an AC duct to the top of the pump

DieselBoost

Let me jump in here guys....kinda new to DTR....Im just curious if its better to replace the factory LP with a different brand(Carter..example) or to just byapss the factory LP and go with the the FASS with or without filters....or this Vulcacn kit...which Im not familiar with....I currently dont have a FP guage but sounds like I need one.
Thanks

P.J

Welcome, and Yes, you do need a gauge.
Plenty of people with stock to moderate hp levels still run stock a pump (which is the Carter). The Fass II (without filter set up) is also a good choice, but it costs a bit more (the 4 year warranty is attractive)

It may be too early to say, but there is a new(er) stock lift pump that is being bought at Cummins dealers that sounds promising. Mine should be in tommorow. Price is RIGHT at about $60.00.
Some users are reporting 18-19 idle and no less than 16 WOT. I have a Carter relocated with the Vulcan kit and get down to about 12-12.5psi when i get into it.

The intank retro scares me and would NOT be something I was interested in warranty or not. I suppose the ONLY way I would have ever ended up with one is that was all they would supply with a VP44 & LP swap under warranty.

I should have my new pump on Monday or Tuesday. Time will tell.

yarddog

If the stock LP on the block is working at 100% there's nothing to worry about. But you don't know unless you have FP gauge, that's why it's so important. The VP itself can pull enough fuel to keep the truck running for many miles if the LP is dead. You wouldn't know until you chang the fuel filter and can't get it started.

There are a lot of options to fix the stock lift pump. One is to get the Vulcan big line and stock LP relocation kit. This will replace the restrictive (not really restrictive unless you're pushing lot of hp with a weak LP) stock lines with bigger and move the LP away from the heat and vibration of the engine.

Or there's the bd-power LP replacement, I've never heard anything bad about this pump. Then there's adding a pusher pump like a holley blue or similar that acts like a lift pump for the stock lift pump.

If you're a DIY'er you can install a Walbro for $100 or so. (Search Walbro) Or you can get the FASSII (pump only) which is a lot of $$$ for what you get IMO.

I almost forgot about the RASP. It's a mechanical pump driven off the engine. It works in parallel to the stock system so if it fails, which is unlikely, the electrical system will kick in.

Then there's the ultimate fix: Getting an F1 cam that uses 12V style cam driven fuel pump. These have been reported to go 300K miles or more but this will cost you around $1200 for parts only.

I didn't mean to write a freakin book about this

DieselBoost

So let me get this right....is the carter an additional pusher that pushes into your LP? And where and how much is the carter and the Vulcan kit.....Im not sure where to pick these items up....I also see people saying "Holley Blue" not sure what this is?
Thanks

yarddog

I'm not an expert on this but I believe the Holley blue is used to replace the stock LP. Some people may use it to feed the stock LP. The carter is the brand of stock LP. I don't know the consensus but if you search for holley blue or "pusher pmp" here I bet there's enough reading for a weekend.

Check summit or jegs for the holley and you can google "vulcan relocation" and search around until you get the best price.

P.J

Vulcan Kit = www.vulcanperformance.com
Carter Pump can be found on EBAY, at NAPA, Cummins Dealer.
Holley Blue/Black is just another electic fuel pump. It can be found at www.jegs.com

LucasLobo

I have the BD Auxilary pump which mounts near the tank on the frame and has a oil pressure switch to kick the pump in at 25psi of oil pressure so the truck starts at lower fuel pressure. with a Edge comp on 5x5 and WOT the lowest i have seen on a BD Xmonitor is 9.5 lbs only on a long run. average is around 24 with highest 32 but not very often usually 29 is the highest.

Napa also sells the stock carter pump but I did hear that a cheaper pump was available from Cummins.