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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 08-16-2007, 05:16 PM   #1 (permalink)
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fuel pressure

how should I go about increasing it? just thought id ask here before i dive into the rest of the internet.

This is for an S52 swap btw.
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Old 08-16-2007, 06:52 PM   #2 (permalink)
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What year and model is your car now? If you have a late production E30 you don't have to do anything to the fuel system, just run the stock regulator on the S52 and it will be fine.
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Old 08-16-2007, 11:46 PM   #3 (permalink)
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It's a 91 318is
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Old 08-17-2007, 12:11 PM   #4 (permalink)
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Looks like the M42 uses a 3.0 BAR system so you will probably be ok with the pump that is in the car. You should be able to be buy the fuel pump itself separate for a E36 and with a little tweaking it will fit in a late E30 pump bracket if you wanted to go all the way and use an E36 3.5 BAR pump. I ran my M50 for months on the stock 3.0 BAR pump and noticed no difference when I went to the 3.5 BAR pump. I lucked out and got the pump for free otherwise I wouldn't of bothered with swaping in the different pump.
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Old 08-17-2007, 09:23 PM   #5 (permalink)
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ah, ok thanks, i was hoping i wouldnt have to get a new pump. yay.
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Old 10-04-2007, 05:11 PM   #6 (permalink)
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I got a 85 320I and some time ago I'd problems with the pressure regulator on the return to the tank.So at the time i saw some valves you could regulate them to your needs.
Before I change the faulty one to a new ,it I'd put a meter on the gas line ,usually got around 3psi ,but when the valve blocked i?d got 7psi and forgetting fuel consumption the car then use to "fly"
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Old 10-04-2007, 06:56 PM   #7 (permalink)
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Quote:
Originally Posted by taz131
I got a 85 320I and some time ago I'd problems with the pressure regulator on the return to the tank.So at the time i saw some valves you could regulate them to your needs.
Before I change the faulty one to a new ,it I'd put a meter on the gas line ,usually got around 3psi ,but when the valve blocked i?d got 7psi and forgetting fuel consumption the car then use to "fly"
Is your car carburated? Because in an E30 with an M20B25 or M42B18 the fuel system should run around 3-3.5 bar max which is about 44psi, and be in the 1-1.5 bar range at idle.
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