83 280zxt odd flooding issue - Nissan : Datsun ZCar forum :Nissan Z Forum: 240Z to 370Z
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post #1 of 4 (permalink) Old 07-31-2019, 11:31 AM Thread Starter
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83 280zxt odd flooding issue

So I bought a 280zxt about a week ago and have a lot of trouble getting it to run right.
I’m new to z’s and theirs a good amount of stuff I’ve never seen or heard of in cars.
Cranking the motor over is a hassle and when it does start it will idle at around 800 rpm with it jumping up and down in small amounts. Basically trying to kill itself and it does. You can keep it running if you keep it reved up but on rare occasion it will just completely cut out. One odd thing I’ve noticed while cranking is if you give the started a break sometimes when you let go it will fire up after I’ve quit. So I think there’s a lot of fuel being dumped in. I check the spark plugs and replaced them because they weren’t the best and were covered in fuel. The wires and distributor are new from previous owner. They were pretty recent. So I’m pretty dang sure it’s flooding. If you take it driving at low speeds it cuts out a lot and will kill itself with a pop, but sometimes will spark back up after the show. If you get it going over 40-50 it runs like a dream. As soon as you come to a stop, your fighting to keep it alive no matter hot or cold.
I did do a fuel pressure test after the filter and I got over 100 which is mind boggling so I ordered a new fuel pump Incase the ones that’s in it is to powerful. My thought is that it could be the fuel regulator. But I’ve read tons of forums with people that have similar issues that just throw me all over the place with different parts.
Things I’ve replaced: battery, spark plugs and fuel filter with the pump on the way. And yes the plugs are gapped right.
If anyone has an idea that can help me before I decide to bring it to a mechanic that would be amazing cause I really wanna drive this old girl
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post #2 of 4 (permalink) Old 08-01-2019, 01:45 PM
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You may have a problem with the pressure regulator on the fuel rail. There is also a possible vacuum leak if it’s running rough. Hard to tell with a newly acquired car.
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post #3 of 4 (permalink) Old 08-05-2019, 02:12 AM
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I agree with pilgrim - check for a vacuum leak. Smoke the engine with the method explained on this forum - it will give you an answer real quick.

1978 280z - stock L28 engine - Dallas, TX
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post #4 of 4 (permalink) Old 08-07-2019, 01:32 PM
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You got a plugged return line at the tank, and a bad gauge = the stock ZX internal relief will lift at 60psi at the pump and about 47-50 at the engine downstream of the filter...

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