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1989 Dodge Ram - VE Pump Tweaks on the Cheap

By Jason Sands
Photography by Jason Sands
1989 Dodge Ram Rear View
1989 Dodge Ram P7100 Injection Pump
Although not as glamorous... 
   
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1989 Dodge Ram P7100 Injection Pump
Although not as glamorous as its big brother, the P7100 injection pump (found on '94-98 Cummins), the VE pump found on '89-'93 Dodges can still be made to produce some good power.
1989 Dodge Ram First Step
Our first step was rotating... 
   
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1989 Dodge Ram First Step
Our first step was rotating the diaphragm. This is done to give the engine more fuel under boost. First, we took off the banjo-style air line connected to the top of the pump. There will be a couple of washers that like to fall out, so make sure you don't lose any pieces.
1989 Dodge Ram Removing Pump Top
Next, we took the pump top... 
   
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1989 Dodge Ram Removing Pump Top
Next, we took the pump top off using a screwdriver. The diaphragm is spring-loaded, so be careful when you take the pump top off--the diaphragm will want to come with it.
1989 Dodge Ram Diaphragm Top
When looking at the top of... 
   
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1989 Dodge Ram Diaphragm Top
When looking at the top of the diaphragm, you'll see a tick mark it in (arrow) noting it's position. Stock is 12 o'clock, or facing the engine. Ours appeared to be set at about 1:30.
1989 Dodge Ram Rotate Diaphragm
Next, rotate the diaphragm... 
   
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1989 Dodge Ram Rotate Diaphragm
Next, rotate the diaphragm 90 to 120 degrees clockwise. Inside, there is an offset traffic-cone shaped eccentric. Rotating it will move the offset further away from the fueling rod, giving more fuel as boost rises. Make sure not to over tighten the banjo air line when you put everything back together.
1989 Dodge Ram Old Fuel Screw Location
Our next free pump tweak involves... 
   
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1989 Dodge Ram Old Fuel Screw Location
Our next free pump tweak involves the full fuel screw that is located at the back of the injection pump (arrow). This is where our major gains would come from. With a screwdriver and 13mm wrench, back the screw out of the pump completely so you can take the metal collar off.
1989 Dodge Ram Removed From Pump
This is what the fuel screw... 
   
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1989 Dodge Ram Removed From Pump
This is what the fuel screw looks like after it is taken out of the pump. Count the number of turns from where it bottoms out on the collar to where it bottoms out on the screw to see where the "stock" setting is. Ours was about six turns.

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