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FTB on a DB2

chevyCowboy

chevyCowboy

I might be crazy but i ain't dumb
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getting close to putting the engine back into my 93. every things just about done so i got the FTB kit out that i orderd from Walking J, and it turns out that it doesnt work on the db2 :mad2:, no big deal ill just use it on my dually when i get it running, but the question is?

is there a way to make a FTB setup on a DB2?

im hopeing so other wise iv got to go pull the FFM off the dually since i had allready drilled and taped it for the larger fitting
 
As you found, the DB2 has a completely different fuel inlet than the DS4. Depending on how much work you want to do, there are several things you can do to increase fuel supply.

The fuel inlet on the head of the DB2 is not real large, so that is a limiting factor right there. I have been told that certain PowerStrokes had DB2s with larger fuel line openings and these can be modified to fit the 6.5 DB2. I did not go this route, so you are on your own there. However, I can tell you that a large plunger Marine DB2 has the same size fuel inlet as our trucks, so maybe its not that big of a deal?

On my engine, I drilled out and tapped my fuel manager and installed a 3/8" barb fitting. Originally I wanted to use an AN fitting, but there is very little room under the manifold from the FM to the injection pump, so a barb fitting allowed more clearance. On the injection pump end, I installed a matching 3/8" hose fitting. If my notes are correct, the DB2 uses a 7/16" X 24 inverted flare fuel fitting. The ID of this fitting was slightly smaller than the drilled inlet on the DB2, so I drilled out the ID of the fitting to match. It wasn't much, but I wanted the pump to be the restriction in the fuel supply, not the supply. I then used 3/8" fuel line from the FM to the pump. I figure this is about the best you can get without modifying the pump itself. If you look at the stock fuel inlet barb fitting for the DB2, its pretty small. A 3/8 hose will give you more fuel flow to the pump, so it should help.

GEPFuelMan-3.jpg

This is my Fuel Manager. I don't have any pictures of the pump fitting.
 
thanks i was going to go hunting for a fitting like that tommorow beacouse i thought that was all that i needed

i to have heard that the old 7.3l IDI's and 6.9's had the larger fittings, havent really searched for them but i do know that a friend had an old 6.9 for that had a db2 pump
 
You can also tun up your transfer pump pressure which will increase your case pressure and timing advance.
 
Disclaimer first, This alteration to your fuel system can ruin your IP or damage your motor, and alter your emission.

There is an allen screw in the inlet opening of the db2 pump. turning the allen screw clock wise raises transfer pump pressure. Good luck, and you may want to adjust your timing arm on the side of your pump to give you better performance.
 
are you talking about turning up the fuel? the allen screw that you have to get to threw the triangle shaped cover on the driver side of the pump?
 
chevyCowboy said:
are you talking about turning up the fuel? the allen screw that you have to get to threw the triangle shaped cover on the driver side of the pump?
Click to expand...


No in the inlet of the fuel feed line, just like on the DS4!
 
Slim Shady said:
Disclaimer first, This alteration to your fuel system can ruin your IP or damage your motor, and alter your emission. (Not a big deal really, surplus engines are cheap...)

There is an allen screw in the inlet opening of the db2 pump. turning the allen screw clock wise raises transfer pump pressure. Good luck, and you may want to adjust your timing arm on the side of your pump to give you better performance.
Click to expand...

Any how to guides for the timing arm adjustment?
 
WarWagon said:
Any how to guides for the timing arm adjustment?
Click to expand...


Adjust the arm after setting the idle speed, then loosen the Allen screw on the arm. then set the little roller wheel on the lowest part of the ramp. Now you can also set the roller wheel where the roller just touches the ramp at idle.

One of the two will give you the best performance. The first is more advance and the second is the closest to factory timing.
 
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