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warm weather hard starting 200 1990

Ok everyone, I've been living with this problem for a couple of springs/summers and I really need to address it.
My '90 240 starts hard on warm days and stalls on a hard stop or a hard right turn.
I replaced the fuel pump relay last summer.
I changed out the pre-pump two weeks ago and that seems to have cured the stalling problem.
Within the last two weeks it has gotten progressively more difficult to start, even when cold.
A trick I have found is to "pump" the fuel pumps by turning on the key, listening for the fuel pump relay to click, then disconnect and reconnect the fuel pump relay 2 more times. The engine then turns over fine.
Once started the engine runs great, but the longer it sits, the harder it is to start. Yesterday we hit 86 here in portland and it took 5 "pumps" on the relay to start the car.
So... any suggestions? I would most appreciate them.

Thanks,

Eric






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