Help with points style ignition 73 corona

[Dazza]

Yep it wont be running on the idle circuit at 1400 RPM so adjusting the mixture screw will do nothing. You wont be able to set the timing with a timing light at 1400 RPM either because you will be getting Vacuum advance and possibly centrifical advance as well so the timing will be retarded if you can get the revs back to idle. I would still be looking for a vacuum leak.

[VendableFall]

Hey dudes, replaced the fuel filter with a new clear one, started her up with some "start yah bastard", once started set the idle to about 1000rpm, it started to die, and i managed to keep it going with the "start yah bastard", so i believe it is a fueling issue, the fuel filter aswell which i expected to be full of fuel? was almost empty.. are they supposed to fill right up?

i then went looking for the air vent for the fuel tank, and found a little black one way valve with a big crack in the side of it,the dudes at repco and supercheap didnt stock anything like it, so ill talk to Toyota monday, went home and popped it open, the rubber diaphram was ruptured, i patched it with some electrical tape lol, and patched the crack in the side with some cold weld plastic glue kinda thing, its drying as we speak.

im hoping that this valve being useless is reducing the vacuum from the tank, leading to the empty fuel filter (which is ovbiuosly between the pump and the tank), leading to my fueling issues.. ideas?

ive got some photos but am not sure how to attach them, it keeps failing to upload, any ideas?

[VendableFall]

Okay got the valve working, still a pretty hard start, and did the same, ran for a few minutes then died, i did also managed to tune the idle and idle mixture screw some more tho while it was running

[ta22fan]

Easiest way to do photos is to load them up to Photobucket, and then include a "forum link" in your post. Toymods has a pretty small size limit on embedded imaged.

Afraid I'm about out of ideas on your mechanical issue - I'm not familiar with how your car delivers fuel from the tank. I don't think your filter needs to fill with fuel, but obviously it should have some fuel in in it. I know with my '74 Celica - if I remove the fuel filter, I have fuel flowing freely from the fuel line from the tank.

[VendableFall]

yeah when i took the old filter off it wasnt untill i tipped it on its side that any fuel came out, mabye a blocked/leaking line? im going to trace the fuel lines all the way back tomorrow, and replace the soft fuel lines, then i suppose the next step is the float level? any tips with this?

[ta22fan]

You may well have an inspection window on the side of the carby with a marker (usually about centre) to indicate the correct fuel level.

[Dazza]

Has your fuel pump got a return line back to the tank? The return line outlet has a restrictor in it if you have this style fuel pump. Is it possible that you have the line to carby and return line the wrong way around.

[VendableFall]

No return line just the single fuel line.



okay a little progress guys, started her up again, after much "priming" and noticed just before she fires, the fuel filter is full, still have to use "start yah bastard" she started up, and the float bowl started to fill, went to half way then stayed there for a minute, at his point i noticed the filter start to empty, then the float level start to drop, then she died. So vaccum leak mabye? clogged fuel line?

so i detached the line from the tank to the fuel filter, and with my handy dandy bike pump, forced as much air as possible down the line as my frame could manage, and it didnt budge, tired this again with the filler cap off and the breather valve disconnected, no imporvemnt, so i think disconnected the line from the tank, and reeated, the air passed through easy ass, so the problem (if there is one back here) is not in the line, but mabye the tank?

i also noticed that there was no fuel in the lines, just after the car was running, surely there should be something in the lines if things are flowing freely?

so im thinking that mabye the line inside the tank is clogged? i should of been able to get air back in with the filler cap off shouldnt i?

/EDIT
bypassed the tank, and attached the fuel filter to a 1.5ltr coke bottle with fuel in it, it started way easier after a little priming, then ran, and ran well, the fuel bowl filled up and stayed where it should and the fuel filter remained about half to 1/3 full, it ran for about 10 mins untill it turned it off and started it again easily, so im thinking i have a blocked fuel tank,

does that mean i need a new one? how do u clear the inside of the tank?
also noticed the fuel that i retrieved from the tank was had red'ish tinge, i thought petrol had a yellowish tinge? could this mean i have rust in my tank which is the reason for the clog?

/EDIT NO 2
bought some fuel doctor and pul that with 5 ltrs of fresh fuel in the tank and turned over the car a few times (with the main lead to the coil unplugged) to try and pull some of the cleaning agent through the line, ill leave it to sit for a while drain the tank and refill it? prime some more see if that works.

[ta22fan]

Unleaded is (in theory) a red/orange colour - so this may be Ok. Seems you are on the right track - basically just need to get fuel flowing freely from your tank and I think you'll be up and running. Some high pressure air back up the fuel line maybe? Not something I've ever had to try doing - but should be safe to do. You must be getting a little bit of fuel through - enough to prime the carby, but clearly not enough to to keep it going - and that's only a very slow rate of flow.

[ctrain]

id take out the tank and clean it, and replace all the lines, they are 40 year old lines. But thats just me,

[Dazza]

The fuel pickup in the tank normally has a sock on the end of it that acts as a filter. It could be blocked or has sucked up inside the pickup pipe. There should be a plate somewhere on the tank that the fuel pickup pipe runs through that you can just unscrew from the fuel tank.

[VendableFall]

SOLVED!

so i put a flexible wire brush down the fuel tank line, and brushed back and forwards, this seemed to clear the line as i could blow into it and hear bubbles in the tank, connected everything back up again, and she starts and runs! hurrah! tuned the idle mixture screw and throttle stop screw!

one last thing, she still hesitates when going from idle (800-900rpm) to throttle wide open, it almost stutter and stalls then picks up, what would this be? seems to lessen as the car gets warmer.



Thank you so much guys, i was at my wits end with this car and you showed me the way, i am forever grateful! it has made me love the car again, and that my friends, money cannot buy!

[ctrain]

probably a vacuum leak, get a can of carby cleaner and start spraying around vacuum line and the inlet manifold, the cleaner will suck it though the leak and the engine should pick up revs, mine hesitated badly,turns out i had a split from my vacuum advance to the carby.

[allencr]

...hesitates when going from idle (800-900rpm) to throttle wide open, it almost stutter and stalls then picks up,

Accelerator pump? You should be able to see 1or 2 small nozzles down the carb's throat that give out a good healthy squirt of fuel each time the throttle is opened, about 1/2 teaspoon or 2-3cc. If not, the pump seal/diaphragm is old/damaged or the pump's check valve is not seating. Also the nozzle/s may be clogged.

[VendableFall]

i hope its not that, as the carby is brand new, ill have a look tho, thanks