Fuel lines

Went and replaced all the fuel lines on my friend's gmc.  

Needed Gates barrier hose,  25' of 3/8" for the supply lines,  25' of 5/16" for the vent lines,  and about 10' of 1/4" for the generator. 

Also bought a set of 3 filler tube hoses from cinnebar,  and there is a 3' piece of 1/2" that is on the vent side up in drivers wheel well. 

Other items were a large supply of stainless hose clamps,  a new fuel selector valve, a 3/8" barbed brass T fitting for the vent lines in the wheel well,  and a 5/16" union to go from 5/16 hose to 1/4" hose to connect to top port of fuel/vapor/surge thingy located in wheel well. 

We also bought and installed a cube style fuel pump on the aux tank line.  I am usually not a fan of these pumps,  but this is not a primary pump, and ease of install/mounting made it ky choice in this situation.  I have same thing on my coach and it is still working after 6 years.  

 

Ramps made and work great.  Ramps with airbags inflated is perfect height.   Not shown here is jackstand and wheel

Chock safely. 

 

Dropped front(aux) tank.  Had a little nest and the vent line looked cracked and was probably source of the leak. 

 

5/16 vent lines feed out to wheel well.  One from each tank,  and the third if I remember goes up front to the passenger side wheel well to the charcoal conister. 

 

One side of tank is held up tight by 3 bolts that go into this metal angle on tank.  The other side is held by 2 j bolt/hooks.  Get the bolts in the straps and a nut on,  the. Lift this side up when putting up tanks. 

 

We did not disturb the senders on this job.  It was a working coach with a fuel leak when tanks were full.   One fitting is the feed, the other goes to vent line that feeds up to gas filler.  Careful not to mix up. 

 

Generator fitting on rear(main) tank.  This is 1/4". And runs to a fitting on lower plate under the onan. 

 

Lifting tank into place.  Straps help,  and you have to be careful to get vent hose in correct place and not pinched. 

 

I just make an crossbar to mount the aux fuel pump and new selector valve.  Others mount it up on floor,  or others move it outside the frame rail.   I use the selector valve to power the fuel pump.   Also make sure you use a quality filter on the pump,  you can buy a wix for about $5,  but it is 5/16 input port and lines are 3/8.  So careful on clamping or get an adaptor from summet.     This has always worked for me on vapor lock and priming carb.  Cheap, simple and easy to do. 

 

Here is how i did the vent lines.   I could not find a 5/16 barbed T,  so i stretched the lines onto a 3/8" brass T.  Originally it had a plastic T located right next to frame.  i chose to get the T as high as I could get it without kinking the vent lines.   For some stupid reason the top port is 1/4", so i stepped down the line that goes to that port.