ok, well i just realized that i have been running a 30 amp fuse as my 1990 toyota pickup EFI fuse when it only calls for a 15. so figuring that i was just out of 15's when i put it in i changed it back. well i left my dads shop and got about a block before it blew. so i have to run a 30 until i can figure it out.

does anyone have any ideas about what i could be? o and could this be a reason why my gas mileage is rediculously bad?!?!

 

possibly.
check the wiring around the transmission for any wires that may be shorting.
you may be able to put a 15 in and shake the wires until you can make it blow.

 

around the transmission? why would electronic fuel injection be around the transmission? o and this transmission is a manual if it makes a difference

 

the ecu powers lots of things...
anyhow, I've heard that O2 sensor wiring can short out quite easily due to where it runs.

 

ooooo ok well ill slap a 15 in there and start shakin wires tomorrow, but if that isnt it what else could it be?

 

Should be as easy to figure out as an SAS.

 

I just blew my EFI fuse, after finding out that the wiring going down the side of the engine melted against the EGR tube.

 

just looked at a wiring diagram and on 89/90 trucks, the 15a EFI fuse powers the ECU and all the sensors.

 

nah deinatelly not. this is electrical not mechanical

 

that's not nice... it's funny but not nice...

 

alright ill check all of those things tomorrow, thanks guys

 

also check the driver side frame rail where it passes beneath the engine
on mine the big pack of wires rubbed on the frame until it wore through
just an idea

 

dont the efi fuse power the fuel pump to? not sure but that could be it unless im wrong but that never happens

 

hahah way to be cocky! very nice. and is there any way to check the fuel pump or any tell tale signs that its going out?

 

Yes, get a multimeter, and test the current draw of the fuel pump. I wouldn't be able to tell you what's a normal reading though.