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LarryS

Fuel pump got louder

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The fuel pump on my 72 tii got louder yesterday. I haven't had a chance to check the pump or sender filters or connections yet but it started me to think about a replacement. Oddly enough, two days ago I removed the bolt on the KF pump to give the little filter a couple of shot of compressed air.

I have read Bill's tii fuel pump options thread http://www.bmw2002faq.com/component/option,com_forum/Itemid,0/page,viewtopic/p,861620/sid,9c21f4cd85ea36ba6e82bf875df757b7/

And Keith Kreeger e-28 pump installation

http://www.my2002tii.com/tii-fuel-pump_how-to.htm

But I'm wondering if anyone knows if these are viable alternatives?

http://www.autopartswarehouse.com/shop_parts/fuel_pump/bmw/2002tii.html

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how do you mean louder ?

if the pump is singing/high pitch/metalic type noise

at the pump - a few things can cause that :

restriction/partial blockage in the fuel system

causing the pump to strain -

- blocked filter.strainers (see huge thread last week

showing you all the filters/screens in the system

to be cleaned)

crushed fuel line/pipe under the car, kinked

hose under the hood blocking flow

bad pump internals - worn out pump

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how do you mean louder ?

Just that the hum noise that it makes, is just louder. It's not a different noise, just a little louder. E.g. I never heard it when I was outside the car with the car idling until yesterday. As I said, I do need to check the filters but I doubt if I crushed any lines, but you never know.

Bill,

I'm considering both of those methods but wanted to know if anyone had experiences with the pumps on the last link in the OP. After more searching, I see both Marshall and LimeySteve have used the AirTex and didn't have any complaints.

Basically, I wanted to know if the AirTex just "dropped in" and was reliable.

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the airtex i used was not the high pressure Tii one. it was a low pressure pump for carbs. airtex does make good pumps, i cannot attest to whether the HP one has good fitment for a tii. judging by the thread earlier this week on tii pump fitment, whatever one you get must have a 90deg fitting a one end.

if it was my tii, i would get the full in-tank setup from an e30. drop in, simple, reliable.

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Just to clarify: it is not entirely correct to say, "must have a 90deg fitting at one end."

for whatever reason on my particular tii, I did not need a 90deg fitting when installing a 5-series pump per the Kreeger method.

Cheers,

Carl

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The day after I started this post, the loudness of the pump went away so I didn't pursue it further and drove the several without issue. Yesterday I took about a 100 mile round trip and when I returned, it idled very low and the loudness returned.

Today I took the pump off and destroyed the mesh filter when trying to get it out. It looked pretty clogged. I went to a couple of local parts stores and they have nothing close to the filter.

Any suggestions for a destroyed mesh fuel pump filter?

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don't know about the mesh filter, I'd guess NLA.

I'd suggest calling 2002AD, ask Ben if he has one .....

800-4-2002AD

An alternative is to install an in-line filter between tank and pump. I did that when doing the Kreeger 5-series pump install.

Cheers,

Carl

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I ended up splicing a 20 micron plastic inline filter between the tank and the fuel pump. http://www.oreillyauto.com/site/c/detail/WIX0/33003/02515.oap?year=1961&make=Pontiac&model=Ventura&vi=1350908&ck=Search_02515_1350908_-1&pt=02515&ppt=C0359

Bill, Thanks for the reminder about the pressure but I dont have a way to measure it. The pump is now much quieter and it idled and drove fine when I took it out for a short drive afterwards.

The pump looks pretty old and I'll probably have to replace it sooner than later.

Carl, Thanks for the offer.

Larry

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the in-line filter: that will do the job !!

as for down-the-road fuel pump replacement: doing the Kreeger 5-series method has worked for me, 2 years and no problems.

(I could not find a new real-deal tii fuel pump)

Cheers,

Carl

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Hi Larry--

After my OEM tii fuel pump blew a couple of fuses last year I replaced it with a new one built for a 528e. I can not say if the pump I had experienced lots of miles since I do not know the details at restoration.

In troubleshooting the problem I measured just less than 4 DC Amps on the circuit (8-Amp fuse but 16 Amp fuse works in a pinch) during normal operation.

I looked carefully at the Keith Krieger method, and Tom Jones found a way to carefully route the 8mm fuel line over the axle so there is no need to reverse the pump fuel flow direction.

As Tom started the installation he showed be the pump current on an oscilloscope-like device; I could see a current increase when the pump brushes got to a bad spot. Clearly if the pump stopped at that spot it would take more current (or a soft-blow hammer) to get it turning.

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