Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum - View Single Post

Alch · 06-11-2010, 01:39 AM

Just for reference: your local autozone, advance, and oreilly are run by retards that are not aware that fuel hoses have different ratings depending on their use. Advance stocked the worst stuff: SAE 30R6 which isn't even rated to 50 PSI and definitely should not be used for a pressurized system. SAE 30R7 has a working pressure of 50 PSI and a burst pressure somewhere above that. Fuel injector hose (SAE 30R9) has a working pressure of somewhere around 100-150 PSI and a burst pressure well over that. SAE 30R10, according to Gates, can be fully submersed in gasoline and other fuels without suffering damage (it's also very expensive and hard to find).

I found the Gates 30R9 fuel injector hose at a local NAPA for $7/ft. The submersible 30R10 was $28/ft, special order, and came in pre-cut 1 ft lengths, so I couldn't replace my 15" long submersed fuel line. Fortunately, it appeared to be in great shape. So, I replaced all of the high pressure, 5/16" lines with SAE 30R9 and the low pressure 1/4" lines with SAE 30R7 and installed a new fuel filter. The remaining fuel that was sitting on the inlet side of my old filter was absolutely filthy. Of course it would be a lot of fun to replace everything with 30R9 and then know with confidence that if I wanted to do something stupid like fill the tank with E85 I wouldn't have to worry about my lines falling apart, but I'll leave that to the next owner of my car.

After installing the fuel pump and filter on the pump bracket I assembled and plumbed my new gas tank. Note that installing the fuel pump bracket and fuel level sender and bracket is significantly easier than removing them from a tank.

(Tape was removed before installing the tank)

Also, the FSM is absolutely terrible regarding showing how all of the lines are routed and what goes where. The closest thing to a half decent hose routing guide is the exploded view of the gas tank and fuel system on Courtesy Nissan's parts page. Keeping my original tank in the same condition that it was when I dropped helped alot with figuring out what goes where.

Following this we had several hours of swearing, busted knuckles and other hijinks related to trying to lift, align and then connect all of the proper hoses. The fuel filler neck and overflow or relief hose (whatever it's called) were the worst. No pictures of that, unfortunately since by that point I had become filth and didn't want to touch my camera.

Tomorrow we'll install the heatshield that goes between the driveshaft and tank, the rear subframe along with SPL collars, and new catback exhaust. Then bolt up the driveshaft, struts, and rear brake calipers and ebrake cables and I should be good to go.

We did test the pump by priming the system several times. The Walbro pump is much louder than the stock one, but I was happy to find no leaks, and hear the fuel running through the system.

06-11-2010, 01:39 AM	#18
Alch Join Date: Jul 2005 Location: Tx Posts: 28 Trader Rating: (0)	Just for reference: your local autozone, advance, and oreilly are run by retards that are not aware that fuel hoses have different ratings depending on their use. Advance stocked the worst stuff: SAE 30R6 which isn't even rated to 50 PSI and definitely should not be used for a pressurized system. SAE 30R7 has a working pressure of 50 PSI and a burst pressure somewhere above that. Fuel injector hose (SAE 30R9) has a working pressure of somewhere around 100-150 PSI and a burst pressure well over that. SAE 30R10, according to Gates, can be fully submersed in gasoline and other fuels without suffering damage (it's also very expensive and hard to find). I found the Gates 30R9 fuel injector hose at a local NAPA for $7/ft. The submersible 30R10 was $28/ft, special order, and came in pre-cut 1 ft lengths, so I couldn't replace my 15" long submersed fuel line. Fortunately, it appeared to be in great shape. So, I replaced all of the high pressure, 5/16" lines with SAE 30R9 and the low pressure 1/4" lines with SAE 30R7 and installed a new fuel filter. The remaining fuel that was sitting on the inlet side of my old filter was absolutely filthy. Of course it would be a lot of fun to replace everything with 30R9 and then know with confidence that if I wanted to do something stupid like fill the tank with E85 I wouldn't have to worry about my lines falling apart, but I'll leave that to the next owner of my car. After installing the fuel pump and filter on the pump bracket I assembled and plumbed my new gas tank. Note that installing the fuel pump bracket and fuel level sender and bracket is significantly easier than removing them from a tank. (Tape was removed before installing the tank) Also, the FSM is absolutely terrible regarding showing how all of the lines are routed and what goes where. The closest thing to a half decent hose routing guide is the exploded view of the gas tank and fuel system on Courtesy Nissan's parts page. Keeping my original tank in the same condition that it was when I dropped helped alot with figuring out what goes where. Following this we had several hours of swearing, busted knuckles and other hijinks related to trying to lift, align and then connect all of the proper hoses. The fuel filler neck and overflow or relief hose (whatever it's called) were the worst. No pictures of that, unfortunately since by that point I had become filth and didn't want to touch my camera. Tomorrow we'll install the heatshield that goes between the driveshaft and tank, the rear subframe along with SPL collars, and new catback exhaust. Then bolt up the driveshaft, struts, and rear brake calipers and ebrake cables and I should be good to go. We did test the pump by priming the system several times. The Walbro pump is much louder than the stock one, but I was happy to find no leaks, and hear the fuel running through the system.