Today’s article will cover the installation of an electric fuel pump on 6.9 and 7.3 Liter IDI Diesels. My 1989 F350 suffered from leaky lines and a defective fuel tank selector valve. This rendered my rear tank useless (I could run anywhere from 3-50 miles before the engine died…with a full tank). This left me stranded several times after killing my batteries in an attempt to re-gain prime. It was time to make a few changes.
You’re probably asking yourself, “which pump should I use?” The factory mechanical pump moves about 30GPH at 5-7psi. Personally, I’m using a a Pro Comp Black (part #2803) which flows 140GPH at 9psi with a Pro Comp 2851 fuel pressure regulator (set to 6psi).
Here’s a comparison of several pumps suitable for our application:

If you like, you can even use a cheapo Mr. Gasket pump ($25-$40) which can be found at most part houses. Once you choose a pump, you will need to obtain the following parts before starting the job:
- A fuel pump block-off plate (diamond-shaped small block chevy type works just fine)
- A standard Bosch-type relay
- Some wire (I used some 10 gauge that was sitting in the garage, you could get away with 14 gauge…I prefer the over kill)
- Fuse holder and fuse
- (Depending on the pump you choose) a fuel pressure regulator
Let’s get to work! First off, I would recommend bypassing the stock lift pump all together. DO NOT feed fuel from your electric pump into the mechanical pump! If the diaphragm ruptures in this configuration you risk filling your crank case with diesel fuel, this WILL CAUSE CATASTROPHIC ENGINE FAILURE! You don’t necessarily have to replace the stop pump with a block off plate, it won’t hurt anything to leave it unhooked. I chose to install the block-off plate for two reasons: 1. Microscopic power gain because the engine no longer has to operate the pump 2. the block-off plate is the only piece of chrome on my engine.
Step 1: Choose a mounting location for your pump. Remember that electric pumps are pushers, not pullers. Try to mount the pump as close to the tanks as possible (the output of the tank selector valve should do nicely).
Step 2: Use 3/8″ fuel hose to connect selector valve to pump and pump to engine. If you like, you can re-use the stock metal line feed line, but i would recommend running hose straight to the motor. Be sure to use a fuel filter between the pump and tanks!
Step 3: Remove mechanical fuel pump and install block-off plate. This will be much easier if you remove the passenger side tire and wheel well…you might be able to pull it off without doing so, not sure.
Step 4: Wire the pump to the relay as follows.
Note: I used the red wire with the green stripe to trigger the relay. Said wire provides 12 Volts to the fuel shut off solenoid with the key in the “run” position.

Step 5: test. If successful, proceed to step 6.
Step 6: celebrate with the beer of your choice.
This article is subject to revision and change whenever I feel like it. I have a few part numbers to add, and more proof reading to do…I just wanted to post it now in the hopes that it might be useful. If you have any questions, feel free to drop me a comment.