vapor lock?

[sblake01]

Remove the three hoses (carefully), pull the clamp that holds the cannister in place, hold the rubber base that it sits in and lift the cannister out. Turn it over and you'll see the filter.

[sblake01]

[76Datsun280z]

Ok, I see what you mean. There's a small round filter that you pop out and I wasn't sure if it was that or the mesh looking filter inside the canister itself that you see after you pop out the small one got replaced. Thanks for the help, I'll email Courtesy to see if they have it by chance or if not I'll ask my local Zman if he's got them for sale.

[280z1975]

Stupid ?, but what does the Carbon Canister do for the EFI of the 280z?

Sometimes I wonder why engines are not made much more simple. I mean, your only driving around with something that is basically using controlled explosions to move you around.

[sblake01]

It's part of the emission control system and it absorbs fuel vapor. The carbed S30's have the cannister also.

[ed653]

I ran across this thread from several years ago while trying to help an uncle in Yuma with his recently acquired 79 280Z (18000 miles!). He has some rough running in hot weather. As I get into this I am seeing that the EFI seems to use the same Bosch components as my 1976 Jaguar XJ-S V12! The fuel pump you posted a photo of looks just like the one in my boot, for example.

I agree that "classic vapor lock" as experienced in carburated cars is probably the wrong term, but I have suffered the same problems reported in the FI vapor lock threads in the Z-car forums. I think what happens is the combination of higher rail temperature plus drooping rail pressure due to leaky injectors or check valve DOES result in vapor formation. With the "race track" (i.e., closed circuit) rail such vapor pockest are slow to clear because there are other lower resistance paths the fuel can take. meanwhile, the injectors in that section of rail are not getting supplied.

I eventually replaced the race track rails (2 were used on the early Jag 5.3L V12) with the U-shaped rail used on later models. Even on this rail, which is but one of the many things Jaguar did along the way to deal with this acknowledged problem, can still suffer vaporization related problems. One of the fixes was a thermally activated vacuum valve mounted on the rail which opens the vacuum feed to one of the fuel regulators, thus raising rail pressure whne the rail is hot.

Ed in Placentia, CA