On a 1999 suburban with 5.7 fuel pump there are 3 tubing connections, one is for fuel supply, one is for the return, and the middle is for what ?

I'm using this setup in re-powering a full size jeep with a 2006 lm7 5.3 motor. I'm also hoping to figure out what parts I will need to install a complete fuel e-vap system.

Any diagrams or pictures would really be a huge help

Thanks....

Rick

 

help needed please

 

fuel e-vap system is what hose 3 is for. I would suggest salvage donor vehicle, same YMM as the fuel pump. JMHO, good luck
David g.

 

I still need help with this...wrecking yard said there was no evap connection on 99 fuel pump.

 

What goes on the circled port on a 99 suburban

 

the tank vents to the evap system somewhere. If there is no other hose into the tank; the hose in question is evap.

 

trying to go off memory and I'm pretty sure that's where a plastic evap line attaches and routes along the top of the tank to the next connection, is it actually hollow? I want to say some of them have nothing hooked to the middle port.

 

I have search so many sources about this and even tried "all data" for 99 suburban wrecking yards. I watched a diy video on how to replace a 99 suburban with a 43 gal fuel tank which showed all three ports with hose connections, but they did not explain what three ports where for.....

 

good point...if its sealed, end of discussion