Replacing Fuel Injector Hose

[twsutt]

I've owned my car (1975 280z) for about three years now and I was told by the previous owner that the fuel injectors had been replaced shortly before I bought it. Recently I smelled more than the usual amount of gasoline vapors, upon opening the hood I noticed that two of the hoses that connect the fuel rail together and one of the hoses that connect the injector to the fuel rail had all sprung leaks. I don't know if the hoses were standard fuel hose, just old or if the clamps were just bad. I can tell that the hoses had all been replaced at some time in the past because all of the clamps had been replaced with the sub-par screw-gear type clamps that cut into the hose.

The '75 FSM says to cut or grind the metal socket off the injector to remove the old hose from the injector. The '76 FSM says to use a soldering iron to cut the hose off the injector, leaving the metal socket in place. Many posts mention using a blade (i.e. x-acto) to cut the hose away instead of using a hot soldering iron on fuel soaked parts. Since I own a '75, do I have to use the method described in the '75 FSM, or are the injectors the same on the '75 - '78 (or through '83)?

Thanks,

Terry

[sblake01]

I've never used the soldering iron method. I've always cut them off w/a blade. I do believe that the injectors are all the same with the possible exception of the very early 75s that had actual Bosch EFI rather than JECS EFI. I've only seen a couple of those and both had already had the injectors changed so I really didn't get to see what, if anything, is different.

[TomoHawk]

My hoses began splitting just after the PO left with his trailer after delivery.

I used a knife when I did my hoses, and removed the entire fuel rail with no problem. I first cut at the top of the injectors to get the whole thing off, the cut away what was left. I did all the hoses at once.

Remember to use only 8mm fuel injection hose, and fuel injection clamps.

thxZ

[twsutt]

I've already got 8' of GoodYear SAE J30R9 fuel injection hose (max working pressure: 100psi / Burst pressure: 900psi) and 12.7 mm - 14.3 mm fuel injection clamps. I've depressurized and removed the fuel rail and loosened the screws on the injectors - I just wasn't sure of the appropriate way to proceed with removing/replacing the hose from the injectors. Looks like cutting is the best way to go.

Edited September 24, 2009 by twsutt
correct clamp range

[Darrel]

sodering iron works well. The ring is needed to keep the hose in place when pushing the hose on.

Cut hose to length after pushing hose onto the injector making sure the hose is seated at the base of the injector. Make sure cut is straight and square. No clamp needed.

The sodering iron won't damage the injector barbs.

[TomoHawk]

No clamp!??

[Darrel]

no clamp on the injector side. The ring pinches down on the hose around the barb fitting. Just like stock nissan.

[sblake01]

No clamp!??

No clamp at the bottom. Only at the fuel rail. That's how they were OEM.

EDIT: Darrel beat me to it..

[TomoHawk]

That's only if you get the hose already clamped/crimped onto the injector. Mine didn't have the hose or the fitting on the injectors when I got them.

Edited September 25, 2009 by TomoHawk

[Darrel]

It's not a crimp, but since you didn't get the ring you had to make do.