On a 1988 4x4 Pickup, can someone describe (or show in a photo) where the fuel pump wiring harness can be disconnected? Thanks!

 

On top of the fuel tank

The pig tail on the fuel pump bracket is about 8" to 12" long.

There is also another plug under the right seat That also has your rear lights as well

Just what are you trying to do??

Change fuel pumps ??

Change fuel tanks??

In either case unless your truck lives in a dry climate getting the lines off the fuel pump bracket is real interesting .

 

Thanks wyoming9, that is exactly what I needed. I found it under the right seat like you said.

I needed that to relieve the fuel pressure in preparation for engine removal. I wanted to do it because the Haynes manual recommends this before engine removal, but Haynes isn't clear about the location of the harness. I also couldn't find that info in the forums or in the FSM. Thanks again!

 

unplugging the electrical to the pump won't relieve the residual fuel pressure in the lines.

 

Correct. Though, according to the Haynes manual, disconnecting the harness to the fuel pump is one of steps in the procedure for relieving the fuel pressure.

 

since it doesn't relieve the pressure, that step is probably there for another reason, like maybe safety or something... I've never disconnected the fuel pump when pulling the motor, I just make sure and yank the battery cables first thing.

I usually wrap a rag around the connection to the cold start injector, then crack the fitting... there is probably a better factory procedure than that, i'm just not aware of it.

you probably already know this, but just in case, I thought that i'd mention that you can also download the Toyota factory service manuals as well, I think that there are sticky links for the urls here on the forum somewhere.

 

OSV:

Ya, exactly. It's safety related. The Haynes manual I have recommends relieving the fuel pressure by starting the engine, disconnecting the harness to the fuel pump while it's idling and shortly after the engine will stall (it took about 5 seconds to stall after I disconnected). Then they say you're supposed to crank the engine over a couple times and at that point the pressure is relieved.

The FSM I have doesn't even mention this procedure but I wanted to do it if it made things safer. I've read about holding a rag over the line to catch any fuel that comes out pressurized and I plan to do that as well. It may be that because the FSM doesn't mention this procedure, it's not really necessary. I dunno, but I decided to play it safe since this is my first crack at engine removal.

Thanks a bunch for the quick response!