When I changed my fuel lines over to FI grade stuff I ended up losing all of the fuel that was in the lines.How do I get fuel to the pump when there is just air in the lines?Car is an 87 GL wagon with a 89 MPFI fuel pump.

When I changed my fuel lines over to FI grade stuff I ended up losing all of the fuel that was in the lines.How do I get fuel to the pump when there is just air in the lines?Car is an 87 GL wagon with a 89 MPFI fuel pump.

 

just turn the little switch with the key to on, then start.

 

The air will take care of itself. The only time you have to bleed fuel lines is when your taking them apart to get rid of the pressure.

 

nipper

yeah if you had a diesel it'd be different. the injectors may be dirty if they sat unused for a while..

how can the pump suck air and get fuel to lines?I thought air was compressable?

There are several differnt pump designs. Some just move fluid while immersed, or need to be primed first.. Others will pull the fluid into them and then push it out, those are self priming pumps.

 

nipper

subaru pumps are self priming?

Basicly most of the EFI fuel pumps can pump air. But if you let it pump air for too long, say good bye to pumpy.

Basicly most of the EFI fuel pumps can pump air. But if you let it pump air for too long, say good bye to pumpy.

Yeah, don't the pumps use the fuel as a lubricant?

And coolant. Running an intank pump in a tank with less than a 1/4 full all the time will kill the pump.

 

As for the older subarus, the pump will suck the fuel out of the tank, pressureise it, and the fuel will push the air through the regulator and back down the return line.

so should I try to turn the pump on for say 5 seconds then attempt to start it?

so should I try to turn the pump on for say 5 seconds then attempt to start it?

 

The pump is back near the gas tank, right?

 

The fuller the tank the better, but it should just go.

the way the fuel pump is in relation with the tank will basically bleed itself. the fuel pump is just about the same level as the fuel outlet on the tank so when gas is put into the tank, it'll push the air through the pump while the pump runs so it'll only run air through the pump for like a second or two. Just cycle the fuel pump a couple times and then you should have fuel up to the intake.