I did the pre pump mod this weekend. I only had about an hour to get the tank down and fix the fittings, so I didn't do the in tank mods. I also installed a clear inline filter before the pump and I noticed there is a lot of air bubbles running through it. I fiilled the tank and ran about 80 miles and still have air in the line. I checked my connections and they are good. Am I going to have to do the in tank mods to get rid of all the air in my system?

 

I would think, yes. Is your inline filter mounted horizontally. If so, it may never purge all of the air in it as it will remain trapped there on top away from the nipple with no way to evacuate it what with gravity and all. Is there a significant amount of air still entering? Also, any air in there may bubble into fuel as it is moved through.

 

JTHarvey already mentioned the foaming issue on returning the fuel to the filler neck. I think doing it that way would simply agitate the fuel and make it look like a poorly drawn beer inside the tank. Think about it. We want to harpoon the tank because the fuel foams when we fill up the tank. And now we want to put the fuel return there so there is now a constant flow of fuel coming down into the tank? Granted it's a LOT less flow than a filler nozzle, but still.........
I vote: take the time to do the job right and you'll end up with the best results. It really DOES make a difference when you get all the air out of the fuel supply.

 

Yes, there is still a lot of air still coming into the filter. It looks like one of those aerators in an aquariaum, a constant stream of bubbles. The engine is not as loud as before so I think what I did must have helped some. I can't imagine how much air must have been coming in before. I am going to do the in tank mods, just didn't have time this weekend, that is why just the fittings for now.

 

Is a reduction of noise the only real bennifit? Or have people seen performance increases?

 

some claim a performance increase, but the main reason I DID it, was to prevent air from entering the system, which with my stock fuel system, the only way out was through the injectors. the injectors don't like pressurizing air to 18000 psi, and it quicky destroys them if enough air is pent up in the system. Kwikkordead is replacing his injectors because one has become REALLY noisy, i guess because they ate some significant air amounts earlier in their life.

 

The only reason I am considering it is because I am **** when it comes to mpg. I like to fill it to the max every time. Well, that means standing out in the cold during the winter and in the summer, the heat and possibly the rain. While I am there, why not go one step further? Although, I am not totally sure it doesn't help seeing as how injectors are for fuel and not a fuel-air mix.

BTW, what do you use to do the Harpoon mod? I would think that if you tried to cut it, you would end up with shavings in the tank. I know I could dremmel it till it was flush with the tank surface but there would be dust in the tank. It would be hard to get it all out but oh well. Any ideas or pearls of wisdom, anyone?

 

Use a ratcheting PVC pipe cutting tool. They are available at any hardware/garden center. It cuts clean with no shavings.

 

That is true. At half throttle one of them is significantly louder than all the rest. Plus my mileage is very low. 11 and falling. They should be here next week sometime.
I originally ordered a brand new set of Alliants from Dieselinnovations because thier web site didn't mention any core charge like everyone else did when selling the new injectors. I thought for the extra money it would be nice to get all new. So I ordered up a set. They called me the next day and said that there indeed was a core charge. Well, I canceled that transaction and told them that the only reason I was buying from them was the lack of core charge. I then called Beans and ordered a set of stockers with all new nozzles. I didn't want anything bigger due to EGT concerns with my stock turbo and 24k gross weight towing. And I wanted NEW nozzles not recons.
And to Dieselinnovations credit, they called me back a few minutes later and told me that they would sell me the injectors outright. They told me it wasn't my fault that the web site didn't say anything about the core charge. But by then it was too late, I told them that I had already bought some injectors from Beans. He still hasn't made any corrections to his web site.

 

What did the injectors cost you?

 

Something like $1060.00 with new nozzles for a set of eight stockers from Beans.
I would have preferred to pay the more than double price for the Alliants, but I couldn't justify in my mind having to give up my old ones when the ones that I was buying were all new and not built up from a finite core resource. They just wanted my old ones back so they could make some money on them by rebuilding and selling them. A deal breaker for me.

 

Yup. It's pretty standard in the automotive trade that there's no core charge on Brand New Parts. Rebuilt stuff, sure. But not new.

They see a real sweet deal and take it. It's not like they have to pay Alliant a core charge. And I don't think it was "to their credit" that they called you back, they just decided that they were losing more in profit on the new ones than they were going to make on those "cores" they were going to rebuild.

I'm with you, Kwik, I'da told 'em to pound sand, too. If more of us spoke with our hip pockets, there'd be less of that kind of greed out there.

Get with the program, Diesel Innovations. We're watching you now!

Funny how this Internet thing works, isn't it?

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I looked around for the best deal at several websites and they all wanted pretty much the same price plus $150.00 core charge on my old injectors. These are BRAND NEW INJECTORS.
DieselInnovations is the only web site that does not mention a core charge along with the brand new Alliants, so I chose to give my money to them because I thought they were doing things right.
Are injectors in that short of supply that even if someone is buying new ones they can get away with charging a core?
It wasn't just D.I. it's everyone.