1982 BMW 320i starting problem (fuel delivery issue...I think) - Bimmerfest - BMW Forums

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E21 (1975 - 1983)

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Old 08-02-2013, 12:42 PM
Mark.t.hagan Mark.t.hagan is offline
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Location: Virginia
Join Date: Aug 2013
Posts: 2
Mein Auto: 1982 BMW 320i
1982 BMW 320i starting problem (fuel delivery issue...I think)

I just bought a 1982 320i. It runs good, the previous owner took very good care of it, he said he pretty much rebuilt the engine.

The only thing wrong with the car is that it has a problem starting. Once you get it started, it runs just fine, just don't turn it off.
The car always starts, it just takes 20-45 seconds to start.
I floor the pedal, turn the ignition, and wait until it starts.
The car turns over until i hear it fire, then I know its about to start.

I've tried many different ways of starting it. I've pumped the pedal, held it down, tried turning the ignition in shorter increments, etc. but the best way (that i've found up until this point) is to floor it and keep the ignition turning until it starts. I'm sure its not good for the starter, but that's just the only way I know how to start it.

The guy replaced the fuel relay, fuel pump, he rebuilt the injectors, and many of the other parts are new.
There is a check valve, i believe he said that it was next to/behind the fuel pressure accumulator that he replaced, but its a possibility that it might be bad causing the fuel lines to...unprime? i guess the word would be. So the 20-45 seconds the car is taking to turn is the amount of time it takes the fuel to travel from the tank to the injectors, and when the car shuts off the fuel, instead of staying in the line, goes back to the tank. Thats his theory.

He also mentioned that the fuel pressure accumulator has not been replaced. He tested it by blowing in it (or something like that) and it held pressure or something. Could that be the issue? I don't really know a whole lot about fuel systems. The part is 170 dollars or so. I would just replace it if I had that type of money to throw around, but I don't.

Any help would be greatly appreciated. Thank you.
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Old 09-08-2013, 02:57 AM
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BMWFatherFigure BMWFatherFigure is offline
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Location: Perth, Western Australia
Join Date: Aug 2012
Posts: 4,106
Mein Auto: E23;E32;E34;E38;R50;R55
If you have the K-Jetronic fuel injection my money is on the heat sensor on the block that increases the fuel delivery when cold. On the 318 it is behind the starter moter. If your car is carbi - tune it up and get a carbi rebuild.
Good - Fast - Cheap: Pick any two.
3 x E32 735iL (Alpine White, Glacier Blue & Kashmir Beige); 2 X E38 735iL (Oxford Green & Alpine White); E53 X5 4.4i (Pearl Beige); R50 Cooper; R55 Cooper Clubman (Both Pure Silver).
E38 Parts Car
E21 318i; E23 735i; E30 318i; E32 735iL; E34 535i; E38 730iL; E53 4.4i
I've just changed my wiper blades and now my reverse lights don't work. Should I change my fuel pump relay?
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Old 05-30-2015, 08:54 AM
jhay1 jhay1 is offline
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Location: Virginia
Join Date: May 2015
Posts: 2
Mein Auto: 1982 320i
My 82' 320i has the same problem and I have tried many things that didn't seem to do anything. If you do find the solution to the problem it would be very helpful to me, because as you know it is a very frustrating problem.
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1982, 320i, accumulator, check, e21, fuel delivery, gas, pressure, prime, problem, problems, start, starting, unprime, valve

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