Hi all, i'v got a 1987 325i sport tech 1 and the fuel pump is now buzzing like crazy. I'v had a mechanic friend check and its an external pump so my question is will this pump be ok??
http://cgi.ebay.co.uk/BMW-External-Fuel ... 1c0d60965d
thanks for any replies
Paul
325i sport fuel pump
Moderator: martauto
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Brianmoooore
- E30 Zone Team Member
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Pump in the link looks suitable.
As willnz says, it could be a sign that your pump is about to quit, but, if your car has a low pressure pump in the tank as well, the noise could be a sign that this pump has failed.
Unplug the tank pump while the engine is running, and see if it makes a difference.
As willnz says, it could be a sign that your pump is about to quit, but, if your car has a low pressure pump in the tank as well, the noise could be a sign that this pump has failed.
Unplug the tank pump while the engine is running, and see if it makes a difference.
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Brianmoooore
- E30 Zone Team Member
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- Joined: Mon Jan 10, 2005 11:00 pm
Why would you do that, when there's a good chance that your existing pump is as good as when it left the factory??golfman wrote:thanks for the help guys, ill order that pump anyway
It may well be but id still like to replace it as its most likely 20 odd years old, ill order a new in-tank pump aswell if needed and filter. I might aswell order a new sender aswell as my fuel gauge can be a bit sporadic at times lol
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Brianmoooore
- E30 Zone Team Member
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You don't comprehend the quality that BMW demanded from its suppliers! The twenty year old one will probably outlast the new aftermarket one.
thats good new fuzzy lol and brian, the fuel pump on there is obviously great quality as its lasted 180k and 20 years but even if it does keep working, i'd have thought a newer more efficient pump would be an improvement, as the old one cant be as good as when it was new
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Brianmoooore
- E30 Zone Team Member
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The fuel pump on any E30 supplies much more fuel than the engine consumes, many times over, and can do so at a far greater pressure than is required.
The fuel pressure regulator bleeds off the excess fuel, and maintains the rail pressure at 2.5 bar, or whatever your particular engine requires, and the injectors flow whatever fuel they are instructed to by the ECU. Your fuel pump would have to be in very poor condition to make the FPR redundant, even at high revs/full power!
The fuel pressure regulator bleeds off the excess fuel, and maintains the rail pressure at 2.5 bar, or whatever your particular engine requires, and the injectors flow whatever fuel they are instructed to by the ECU. Your fuel pump would have to be in very poor condition to make the FPR redundant, even at high revs/full power!
Hi i cant comment on the fuel pump but I thought it a good oppertunity to ask why my 88 325 auto is drinking soo much fuel, I filled the tank then drove 10 miles to have a service 2 and tappets done then drove 10 miles home parked her in the garage... drove maybe another 50 miles and then today i took it for a blast along the by-pass and its nearly empty!!!
Thanks for any help on this...
Thanks for any help on this...
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Brianmoooore
- E30 Zone Team Member
- Posts: 49358
- Joined: Mon Jan 10, 2005 11:00 pm
No it's not! It will be noisy (but still perfectly healthy) if the low pressure pump feeding it has failed.golfman wrote:even so, if its buzzing its obviously on its way out,
how much fuel was in it when you got it back from its sertvice?Geea wrote:Hi i cant comment on the fuel pump but I thought it a good oppertunity to ask why my 88 325 auto is drinking soo much fuel, I filled the tank then drove 10 miles to have a service 2 and tappets done then drove 10 miles home parked her in the garage... drove maybe another 50 miles and then today i took it for a blast along the by-pass and its nearly empty!!!
Thanks for any help on this...
