chaseincats

It's EFI. I'll try to start it in the garage and look under it for wet spots on the lines.

The fuel filter and lines are brand new and pretty tight on there (no pressure gauge but I may get one in the future).

Hi guys, I noticed yesterday a periodic gasoline (not exhaust) smell in the cabin while driving with the windows down. With the windows up, the smell disappears. I opened the hood while the car was running and didn't smell any gasoline then got under the car near the fuel pump and didn't smell it there either. I thought it could be the vapor tank hoses but if that was the case, I'd smell it in the cabin all the time I'd think. I can only smell it while driving with the windows down. Any ideas? EDIT: I started it and sniffed all over the engine bay and it seems to be coming from the passenger side firewall area (near the battery). I'm guessing it's being blown back there by the fan. I tightened all the fuel line hose clamps (which I was able to tighten maybe a quarter turn) but the hoses looked fine. I checked my carbon canister's filter which looks brand new. Any other spots I should check? I really only smell it while the car is running.

Interesting I had no idea there was a size differential. I did take it out last night with everything connected and did notice the car was a little bit more sluggish, I'm assuming that's mostly due to EGR and not the carb canister? I had the canister hooked up for a while before I discovered it had a small vacuum leak.

Thanks for the pictures, so the OEM throttlebody does seem to have two inlets

Gotcha - where did you hook up your distributor's vacuum advance pod?

Does the OEM throttle body have 2 ported vacuum ports? I have the weber big-throat one and it only has one port so I was considering using 2 T-connectors to hook the carbon canister, distributor and EGR to the same port, would that work?

Does anyone know where the EGR's vacuum line plugs in? I read in the FSM that it plugs into the throttle body's ported vacuum port but then it notes that the only thing that is plugged in there is the T connector that comes from the dizzy & charcoal canister... Any ideas?

Gotcha thanks! The car was originally automatic but the PO converted it to manual so them overlooking that wiring might also be it. Since the part number is the same, I'm guessing there wouldn't be any reason to swap the plugs so its wired 'correctly' right?

So this is an odd one - I opened my engine relay bracket (the one under the black metal cover on the passenger's side) to clean the teeth on the relays and noticed one relay wasn't plugged in and there doesn't seem to be a connector for it on the harness (top middle). Any ideas what's going on here? The car runs as-is but I'm just curious

So I went down just now with a fuel pressure gauge and unplugged the oil pressure switch connector and the pump indeed did come on. Does that mean my fuel pressure control relay was stuck open all these years?

The pump (when I last used a gauge between the filter and rail a few years back) read 36 when the pump was primed and during operation. Today, it reads 10 during priming and 36 during operation which seems to be the issue.

I'll try that today and report back. I actually tested it with the FPR vacuum hose unplugged (and capped) and got the same result. I also checked the FPR for vacuum leaks but it's solid.

My car and my friends' 78 work like that and our oil pump switches are plugged in 🤷‍♂️

It depends if you have the 5 or 7 pin AFR connector. The later 280z AFRs had the fuel pump hardware removed from the AFR's jurisdiction which is how the pump can be primed in the "on" position. The problem isn't (for the moment) that the pressure isn't holding in the rail overnight, it's that I'm not getting 36psi to the rail until a fair bit of cranking. Good point with the hoses.

Hi guys, So I'm having a strange issue here. I recently changed my fuel injectors and fuel filter (for the first time in 4 years) and the car started up on the first crank but gradually started taking longer and longer to start with each drive. When I unhooked my old fuel filter to change it, the gas coming out of the bottom was black for some reason (the gas coming out of the filter was clear though, so the filter was working). I went to my local parts store and rented a fuel pressure gauge then spliced it in between the fuel filter & fuel rail. When I primed the pump by turning the key to "on", the gauge read 10psi. I cleared the gauge and primed the pump with the key again, this time it read 5psi. I cranked the car, and after a bit, the gauge hit 36 psi and the car started immediately. I checked the pressure a couple years ago when I had a different issue and I remember the gauge reading 36 immediately with the key set to "on." Note: the later 280s prime the pump with the key in the "on" position, not just when the car is cranking like the earlier cars. I would have thought it was the fuel pump, but the car doesn't stumble when revved high or on inclines and once it gets to 36PSI, it stays there. The tank looks clean when I look in the inspection hole (the sending unit is accessible via the hatch on a '78). Could the seals in the pump be coming apart (do pumps have these)? The black gas that came out of the bottom of the filter was liquid and didn't have any goop or chunks in it indicating a clogged rail. The only strange thing that comes to mind is the pump used to hum for a good 5-10 seconds when I put the key in "on" but it no longer does that - it clicks on then off immediately when putting the key in "on." Not sure if that helps diagnose this but it's something I noticed. Any ideas? -chase

Just keep us in the loop when you eventually get to it since I don't think many people have seen how this is hooked up or even knew this feature existed (I sure didn't). Will you need to make a harness for it, or is it already in the loom just disconnected in the non-JDM models?

please document this 🙂

Oh wow, I'd love to see how/if this works.

Wow, you certainly did. I've never heard of parking lights until now I guess - thanks!

Does anybody know what went on the center console that this panel covers up? My car came with the original panel cover and was always curious. This is the panel: https://zcardepot.com/products/console-switch-delete-plate-cover-plug-240z-260z-280z

And here is the end of the post-credits scene for this feature-length thread: after 3 separate mismatched injector shipments from rockauto, I finally got 6 matching ones and sent the rest back. Took the car out today for the first time and interestingly enough, with the new reman injectors, I needed to richen the car a bit to get it to our numbers. I expected the old injectors to have had a diminished fuel output due to age but who knows.

Update: The issue was old/tired/maybe dirty injectors. Bought new injectors/fuel filter and it starts on the first crank when stone cold.

Hi, I tested my EGR by connecting the BPT valve and later the EGR valve directly to intake vacuum (my thermal vacuum valve isn't working) and the engine almost immediately died and the EGR valve made this strange whistling noise. Any idea why this happens? The engine was at operating temp in the video: https://www.youtube.com/watch?v=hTZni7rL87k

Good point about them matching regardless of flow rate. I just took a look at the bottoms to compare what was on there (left) and the Bosch ones I bought (right) and they look way different. Are the ones that were on there for the turbo or just some weird reproduction maybe?