Fuel pump???
 

Ok so even with the AD100 pushing fuel to the stock frame rail mounted fuel pump i can watch the FP drop to about 50psi @ WOT. I have been looking around online and can get just the pump itself instead of the whole water separator and pump. Has anybody ever replaced the actual fuel pump instead of the whole rail mounted water separator/fuel pump?

This would be the fuel pump im talking about. rail mounted fuel pump

This one is a Racor unit. racor fuel pump

Out of the 2 i linked which one do yall think would be more reliable?

What's the rest of your fuel system consist of?

Blue spring upgrade, AD100, 155cc/30% injectors.

Stock banjo bolts? Are you still running up through the fuel filter on top of the motor?

If you're draining pressure now... I'd just buy a fuel lab or an A1000 pump to put in front of that AD100, eliminate the stock pump all together, and run that right to the heads directly, bypassing the filter on top of the motor too.

What size line do you have coming from your tank to your AD100? That might be a problem too. Does the fuel pressure drop still happen when you have a full tank? A sump would be a good idea too.

I have read that when a seperate regulated return system is put in the filter/regulator on the motor becomes unnecessary. Although you are going to have to do some plumbing in either stainless or braided directly to the heads to eliminate it. Further, I have read that some of these systems deliver better mpg at lower psi, lower as in below 50. Most of these users are AD2, so I don't know how much it relates to what you are doing.

A sump or low profile bulkhead fitting may be what you need. Both of these would eliminate the load created by sucking the fuel up through the tank. Mdub and I have gone rounds about which is better in the past, and until I get a bulkhead fitting, my opinion will remain speculation.

Good point Karl, a regulated return would be a good idea too, especially if eliminating the fuel bowl. You can use a RR with the fuel bowl too, but only one of them is going to be doing the regulating... so you could just stretch the crap out of the spring in the bowl to effectively eliminate that as a return, and let the good return do the work.

Karl I had read a couple posts about the lower PSI helping too, but it seemed to vary greatly. Some said they noticed throttle response improvement, others said they found no change, some said it was worse. I think for the time being I'm going to keep my pressure where it's always been at.


As for the fitting or the sump... eh whatever works I guess. The sump looks purdier!:c:

Both the A1000 and fuel lab pumps only rate @45psi. How is that sufficient for a system that needs 60+-psi? And both are way out of budget for me so i guess ill just get the stock one.

The only thing I can come up with is that the aftermarket pumps have greater volume at lower pressures than the OEM pumps do. I base this on the only ones preaching lower fuel psi have an aftermarket set up.

I just dont see a pump only rated to 45psi being good for a system that needs at least +55psi to keep the injectors working. I think im gonna get a fuel sump and new stock pump.

It flows 700lbs/min at 45psi... it's adjustable. This pump is made for 1000+HP motors, it will be more than adequate. It would just flow less fuel at a higher pressure. It's all relative to what you're doing. It doesn't mean it can only do 45psi, it can do basically whatever you want, but flow will either rise or drop depending on pressure needed. This and the fuel lab are very widely used on high performance diesels everywhere. Base pressure on the A1000 is adjustable from 30-70psi from what I'm reading.

Ahhh ok thats what i was wondering man. I might put that on the truck then instead of the stock pump. Now if i was to go the route of the A1000 and get rid of the stock rasil pump and the fuel filter on top of the engine what whould regulate the fuel pressure and what would i do for fuel return lines? Or does a 6.0 have fuel return lines? Sorry for all the questions but im not very familiar with this part of the fuel system. And also if using the A1000 would it be able to hold 65psi under load? Thanks for the info man. Im just trying to figure out the best route to go for my needs and budget.

The only thing... if you go that route you'll need to go through the top filter housing, since that's where your regulator is. The only way to bypass that is to add a regulated return. Dozers Diesel is having a sale on RR's right now, I believe the stage 1 RR is $400. It all adds up... haha. You can just do the A1000 and run it into the stock filter housing though, not a big deal. Then when you're ready to upgrade but a RR. Right now fuel enters the fuel bowl, through the filter and the spring is what regualtes the fuel, so some fuel goes to the heads, the rest of it back to the stock filter housing and then to the tank. I believe it only runs through the filter housing because it used to be heated in the pre 05 trucks. They've since done away with the heater, but didn't want to add the cost of re-routing the return fuel.

I still think the fuel lab/A1000 is your best option, you've already got a good lift pump. :c:

OH, and Dozers has 4 A1000's on the shelf, selling for $300 shipped, today ONLY!

Ok so all I have to do is take the rail mount pump off and hook the likes up to the A1000? And from what i read on their site i need to buy a regulator to get 65psi from the pump. or will my "blue spring" do that job untill i get a regulated return? And dang i wish i had $300 right now because i would scoop that thing up asap.

The OEM "regulated return" (the blue spring) sucks. Plain and simple, it's a crummy way to maintain pressure. It would work, but it's not ideal. A true RR is the way to go IMO, but obviously money permits us from doing everything the ideal way most of the time. I don't see why you couldn't put the A1000 on to your current system and just let the blue spring do it's thing, it's still regulating pressure, though not the best way.

I'm tempted to pick one up myself at that price... but it's x-mas shopping time haha

Yea man you hit the nail on the head with them money permitting us from doing exactly what we want all the time. I think for now im just going to get either the stock pump or the A1000 and just run the blue spring. I have a deployment coming up and the wife said get me a build sheet of what you want and she gonna take the truck to my builder and have it done up. So im gonna get the RR, new tunes from gearhead and the hybrid turbo from Mad Turbo Werks. And the Edge Insight CS with egt probe. And this is the main thing holding me back on just grabbing a stock pump but dang i need to do something soon. Anyways man thanks for all the info now i have to just make my decision. :argh::scare2:

My vote would probably be just get a stock pump and save your money to do the A1000 and RR at the same time. :c: Way less of a headache this way too.

Yea I am leaning that way too. Just would be nice to get everything at once. But you know how that goes.