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Author: Subject: EFI fuel pressure confusion
CTLeeds

posted on 17/4/19 at 06:02 PM Reply With Quote
EFI fuel pressure confusion

Hi guys,

I'm a bit confused about the fuel pressure on my car. It's a BMW engined car and should have 3.5 bar approx at the fuel rail when it's under load. I've recently changed the fuel pump as when I took it for a run on the rolling road the fuel pressure was dropping right off after 5000rpm and the guys said it was the fuel pump. It was a cheap ebay 044 copy which I've replaced with a genuine Bosch 077 unit. The pressure is now 2.5 bar at the rail all the time. Doesn't matter what revs the engine is at, whether the vacuum line to the regulator is connected or not it's 2.5 bar. I've replaced the regulator as well with a new BMW 3.5 bar unit. I've also checked the results using two different gauges. I also removed the filters to check it wasn't that either.

I'm confused! The engine seems to be running okay but maybe a bit lean as I'm getting a few pops in the exhaust...

Advice appreciated...

Chris

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big-vee-twin

posted on 17/4/19 at 10:10 PM Reply With Quote
077 is a Diesel pump with an operating pressure of 1.5 bar.





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CTLeeds

posted on 18/4/19 at 05:27 AM Reply With Quote
quote:
Originally posted by big-vee-twin
077 is a Diesel pump with an operating pressure of 1.5 bar.


Apologies, my mistake. It's an 070.

Thanks,

Chris

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