Stalling

[Tiger]

Get fuel pressure gauge to test the fuel pump... easy test from engine compartment. You do need that T adapter and extra hose and clamps to do the connection.

I know there is no adjustment on the CPS... but I do recall one time on this forum... someone installed it and it was hitting the cogs... thus destroying the CPS... don't know how that happens.

The general consensus on the CPS is that if it looks like the orignal... all metal housing, then it is probably ok... but if it is plastic housing and a round sensor tip... this is junk.

[urpin]

Since you usually get what you pay for. After spending over $200 the sensor should be good.
This problem really did sound like it would have been the CPS.
Just wondering if there are any error codes that come up.

[Tiger]

No error code because he disconnect the batteries.

[Ferrett 1962]

Well after some testing I believe the fuel pump is the problem, tried to start this morning and no go so did bypass for fuel pump and the pump kicked for a second and stopped tried to start and the car started for a second and cut out also no more sound from the pump. I did check for power at the fuse with and without the bypass and had power through fuse so I checked at the plug for the pump as per service book again with and without bypass and had power to terminal 5 with the bypass but not without so it looks like the pump. Any other tests I can do before I try to find a pump I don't have to sell a kidney to pay for? Just looked on ebay, does anyone know what TREperformance pumps are like. Called the dealer and they will have to order from Germany and they want $555.67 for one but I will pull mine out first to make sure I get the right part OEM lists it but I want to make sure, dealer says two weeks but I can get it from USA quicker can someone advise me of a good brand to go for.

[Tiger]

Can't you order from USA? Like Rockauto.com or bmaparts.com?

In USA... there are cheap chinese fuel pumps for like $35.

That $555 is the complete assembly with fuel level sensor... you can just replace the fuel pump alone and reuse the rest of the assembly.

[Ferrett 1962]

I know I can just replace the motor from the pump but I will pull it out first to check part number before ordering and to check the frame it sits in is not damaged, I was just wondering about the cheap pumps and if they are reliable or total crap. Any ideas on a brand with a good record from people in the states, there are a number on ebay claiming to be good ( as you would expect) but are there any I should avoid?

[Ferrett 1962]

Ok so I pulled the fuel pump (not as much fun as it sounds). This morning I tried to start again with no go so I again ran the bypass for the pump and the car started, ran and stopped three times then nothing, so after removing the pump I connected power to it and it worked but sounded strained and pumped the last of the fuel in it in spurts, when empty it ran smooth and quiet only for a few seconds because I know it should not run for long dry. After this I connected the wires from the sender to it again plugged in the harness and reconnected the battery, ran the bypass for the relay and the pump ran non stop again only for a short time (don't want to stuff it if it is ok). Could it be that it works but can't build preasure? is it ok to sit the bottom into a water bucket and see how well it goes or will that cause problems, I am not sure how they work and don't want to waste money on something that is not broken.

[Tiger]

For your safety... I'd say stop playing with the fuel pump... don't want flash fire or explosion from sparking. If you goes back a couple of years ago... china fuel pumps are crap... even though some of them do offer lifetime warranty... which means nothing because it cost you money to send it in to them and a car that is not running.

Most of the problem with the China fuel pump is the failure of checkvalves... and also the fuel pump pressure. Nowdays, if you buy a brand name one... it should be okay...

Again with BMW's, it is also very common for the fuel pump to go bad too... fuel pump and CPS are the two things that goes bad all the time as the car get older. Since you said the car ran better with new CPS, it is no doubt that the old CPS is not good. Now you just need to get the fuel pump and move on.

[Ferrett 1962]

I was very carefull with testing the pump and don't need to do more with it, got new pump here in OZ and it is already on it's way express. Mine was a pierburg pump and the new one is a direct replacement with no mods needed, should be overnight delivery so I hope it will be here tomorrow morning then I need a couple of clamps and it should be good to go At least with getting from Australia I don't have to wait for it to get from USA or other.

[genphreak]

TrePerformance are excellent, but have an external inline check valve handy when you do the install. Out of two I've installed, I needed the check on one. The TrePerformance pumps are fine, but the install is fiddly as you have to solder the wires and set the in-tank pump height after fitting it in the pump cage.

An OE one wit the full cage is a simple install as all that comes with it, not just the pump.