fuel injection

[78blackpearlz]

hey guys this is my first post on the website so forgive me if its not in a well mannered order, but i noticed a couple days ago that one of my fuel injectors was leaking so i ordered the parts and everything i need to replace it and im just curious as to how difficult of a job its gonna be. i have a stock L28 engine.

thanks,

robert

[siteunseen]

Have you tried tightening the clamps? That's usually where they leak from. If the hose is split then here's a good read, http://www.classiczcars.com/forums/fuel-injection-s30/33005-1976-280z-feul-injectors-installation.html

[78blackpearlz]

unfortunately it is coming from the actual injector (more of a spraying out then just leaking). im guessing one of the o-rings need changing and thats why its leaking. not 100% on that tho.

[Zed Head]

Site makes a good point. The hoses will crack internally lengthwise and leave a very tiny path for fuel to squirt out, in about a pin's width stream. Injector body's do give up occasionally though, but are not fixable.

It's not a hard job. On an old engine the hardest part might be removing the hoses. Best to not even try saving them, just cut them to get the rail and injectors out as an assembly, then carefully cut the leftover pieces lengthwise just enough to loosen them and use some pliers to twist them off.

There is one bolt in the middle that I tend to overlook, an intake manifold bolt that is also a clamp bolt. If you have "all" of the bolts and screws out and the rail still won't come off, it's probably that one, still there.

Also, the hoses to the FPR need to be just the right length to slip around and get the FPR back on but still have enough hose to clamp properly. It's a back and forth operation. Match the length of the old hoses before you cut them up. Best to replace all of the hoses while it's off.

One more also - today's fuel injection hose seems to creep quite a bit after installation. Recheck the clamps several times after a few heating and cooling cycles.

[78blackpearlz]

alright guys. thanks for the help and the quick responses. this is the first time working on the injection system so im a bit nervous about it to be honest.

[Zed Head]

Don't forget the good ol' factory service manual. These old cars were high maintenance and have very good instructions in the manual. The whole procedure, including replacing the hoses on the injectors themselves, is written up in the Engine Fuel chapter.

Replace the filter while you're in there too. Once you get the EFI hose clamped on it does not want to come off again.

Index of /FSM/280z

[78blackpearlz]

oh yea that was one of the first things i bought when i got the car along with the hanes manuel for it. but i replaced the fuel filter not to long ago and money is a bit of an issue for me since im in college and only making minimum wage at my job, so is that absolutely neccesary?

[Zed Head]

Not necessary. If you're really tight on money though, and the engine runs well, you might look at replacing hoses only on the injectors, like site suggested. Take a really good look at the where the leak is. The injector bodies don't break that often, but the hoses do. You'll still need to take the rail and injectors off.

[78blackpearlz]

alright i appreciate the help. im pretty sure its coming from the body tho and i already have the parts ordered just had to break the piggy bank . either way 37 year old injectors that sat for 20 some odd years so i think they could use some replacing anyways.

[Zed Head]

What brand of new injector did you get?

[78blackpearlz]

I got the injector off of the zstore and it didnt specify which brand it is but I havve ordered numorous parts from them and all have worked great so I trust the website. I know I should have done a bit more research than I did but was in a bit of a pinch so just went ahead and ordered it.

[sscanf]

You might find this thread helpful: http://www.classiczcars.com/forums/fuel-injection-s30/45472-1976-efi-overhaul.html?highlight=#post392279