Question about BMW 525

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My brother needs to know what fuel pump & presure

My brother needs to know what fuel pump & what presure amount to get for the make & year BMW 1989 525 I.
He lives in Albque NM.
I've got his cell number to contact him directly to resolve his questions

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195 - 200 liter per hour. The parts store should have the information on his type car. Fuel pressure should be 30 psi in order to start the car.

Posted on May 18, 2009

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I have a 2004 dodge ram 5.7 liter . O have difficulty starting my truck. Some times it starts fine but other rimes I have to pump the gas and wen it starts a small amount of smoke comes out.truck runs...


I have seen two different problems with symptoms like this. 1. A leaking injector. If one of the injectors is leaking a small amount through the pintle on the end of the injector it will bleed the fuel system presure off and dribble fuel into the cylinder, fouling that cylinder. When you try to start it the fuel that has pooled into the manifold will create smoke when it does start. And since the fuel pressure has bleed off to zero PSI in the fuel supply lines it will need time for the fuel pump to recover the system up to normal operating presure. Presure testing (bench test) of the injectors is needed to verify this. 2. A bad fuel pump, relief valve, or bleed-back check valve will bleed the fuel system presure off while it is sitting. To find out if this may be the problem a fuel presure guage set needs to be installed and then run the engine, verify the operating presure is normal, and then shut the engine down and watch the fuel pressure for exessive drop.

The leaking injector is more apt to create the smoke when it fires up, but both can cause this. I would start with check #2 first. Of course there are many other things that can cause symtoms like this but these 2 are the most likely causes.

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