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Hi everyone, I'm seeking advice with a fuelling issue. My fuel tank had a leak and i took my car(1990 r32 gts-4) to a mechanic to get it fixed up. He fixed the leak and replaced my lines since they were old and cracking. When driving home, when coming to a stop my car would just drop to 0rpm and stall. I took the car back to him and he said i had a bad fuel pump and replaced it. I got my car back, but now my car was idling at 1400-1500rpm. I got home and saw that he had unplugged my TPS, and so it was just going on the fall back system and idling around 1500rpm. After plugging the TPS back in, the car had the same fuel pressure issue. I put a fuel pressure gauge in and when turning the ignition on, the pressure goes up to around 50psi. When i start the car it backs off a bit, down to around 35psi and then just slowly drops to zero and stalls. 

Does anyone know what this guy could have done or has anyone had this problem before? Just looking to know what I should be checking first. 

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14 hours ago, Nomu said:

Hi everyone, I'm seeking advice with a fuelling issue. My fuel tank had a leak and i took my car(1990 r32 gts-4) to a mechanic to get it fixed up. He fixed the leak and replaced my lines since they were old and cracking. When driving home, when coming to a stop my car would just drop to 0rpm and stall. I took the car back to him and he said i had a bad fuel pump and replaced it. I got my car back, but now my car was idling at 1400-1500rpm. I got home and saw that he had unplugged my TPS, and so it was just going on the fall back system and idling around 1500rpm. After plugging the TPS back in, the car had the same fuel pressure issue. I put a fuel pressure gauge in and when turning the ignition on, the pressure goes up to around 50psi. When i start the car it backs off a bit, down to around 35psi and then just slowly drops to zero and stalls. 

Does anyone know what this guy could have done or has anyone had this problem before? Just looking to know what I should be checking first. 

So the car has proper fuel pressure when the tps is unplugged?

The fuel pump control module has likely failed. When the car drops back to idle it is supposed to drop the speed of the fuel pump to prevent excessivly circulating fuel. Sounds like the low side is playing up

Direct wire your fuel pump through a relay as suggested

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