Airtex E8445 fuel pump flow direction, I installed the new pump and was gratified Options

[Jamie]

..to hear it run, but there are no directions or markings to indicate direction of flow? The Instructions show mounting details well, but no IN/OUT flow indication? (IMG:style_emoticons/default/sunglasses.gif)

[TravisNeff]

Confirmed, the screw on hose barb is the inlet.

[Jamie]

Confirmed, the screw on hose barb is the inlet.

Thanks Travis, I did install it correctly, thank goodness! You've been a great help for me in this process. (IMG:style_emoticons/default/beer.gif)

[ClayPerrine]

Confirmed, the screw on hose barb is the inlet.

Thanks Travis, I did install it correctly, thank goodness! You've been a great help for me in this process. (IMG:style_emoticons/default/beer.gif)

While the most common reason for no fuel flow is a pinched line, it is possible to wire the airtex pump backwards. That causes no fuel flow too.

[Jamie]

Confirmed, the screw on hose barb is the inlet.

Thanks Travis, I did install it correctly, thank goodness! You've been a great help for me in this process. (IMG:style_emoticons/default/beer.gif)

While the most common reason for no fuel flow is a pinched line, it is possible to wire the airtex pump backwards. That causes no fuel flow too.

Clay, fortunately the polarity contacts on the pump are well marked, but I have a technical question for you. As I recall, although this project has dragged on for more than a year now, the old pump when activated would run for various intervals until the system was pressurized, then shut off. When I installed the Airtex last week, it runs for about 2 sec. and then shuts off. There is still some air in the fuel lines, especially visible in the secondary fuel filter installed in the engine compartment. I have cycled the pump many times, so what component in the electrical system shuts the pump off so quickly, is there a pressure sensor somewhere? When I finally get the engine running, will the air purge itself from the system or will I have to attempt that manually?

[ClayPerrine]

Confirmed, the screw on hose barb is the inlet.

Thanks Travis, I did install it correctly, thank goodness! You've been a great help for me in this process. (IMG:style_emoticons/default/beer.gif)

While the most common reason for no fuel flow is a pinched line, it is possible to wire the airtex pump backwards. That causes no fuel flow too.

Clay, fortunately the polarity contacts on the pump are well marked, but I have a technical question for you. As I recall, although this project has dragged on for more than a year now, the old pump when activated would run for various intervals until the system was pressurized, then shut off. When I installed the Airtex last week, it runs for about 2 sec. and then shuts off. There is still some air in the fuel lines, especially visible in the secondary fuel filter installed in the engine compartment. I have cycled the pump many times, so what component in the electrical system shuts the pump off so quickly, is there a pressure sensor somewhere? When I finally get the engine running, will the air purge itself from the system or will I have to attempt that manually?

I am assuming this is D-Jet...

Shoot some carb spray in the intake and see if it tries to fire. This will tell us if it is an issue with ignition or fuel injection.


There is a hose barb on one of the fuel rails (can't remember which side) that is plugged with a tiny screw. Remove the screw, and install a fuel pressure gauge. Cycle the key a few times, and see if the fuel pressure comes up. It should be 28 psi. If it doesn't, remove the fuel pump relay and jumper pins 30 and 87. The fuel pump should come on, and the pressure should come up.

Also, with the key on, lean into the engine compartment and open the throttle. You should hear the injectors click. If you don't, you have an electrical issue with the FI. I would start with the relays on the relay board.