Author Topic: HELP!! 3rd BUSTED FUEL PUMP ! (Read 6298 times)

charlesmarseille · « **on:** April 11, 2009, 04:06:28 AM »

okay so there goes:
1991 bmw 318i m42, about 220k kilometers, I have a leak at the oil filter housing, where the o ring goes, i changed the gasket but forgot the oring, now a lot of oil gets out that way, thus, im getting quite some oil on the crankshaft position sensor, and my car is acting really wierd now.
It wont turn over, its the third pump that goes in it since two weeks, and they all end up busted(not operating when plgged un a batery). I have voltage to the fuel pump when attempting to start (from 11.0 to 15.6, is this too much?) and when i try to start the car, it sometimes goes up to 400-500RPM then dies, like if there was no gas going there. I dont have a pressure tester so i didnt test my fuel P. My question is: what can break my pumps this way? ECU? CPS? and the check engine light sends the code 1215 (airflow sensor) but i just replaced the intake elbow, and did the throttle body hoses delete mod+ changed all intake gaskets. 2nd problem(but less important): my engine does a wastegate-like sound when reving, it seems to be an intake sound, but only when im rolling. anyways, what do you guys think of that?
thanks a lot

charlesmarseille · « **Reply #1 on:** April 11, 2009, 04:07:38 AM »

by the way, fuel pump relay and main relay are good, pump is brand new(i rolled about 60km tonight before it failed). a luck its a 1 year warranty!

B318M42W · « **Reply #2 on:** April 11, 2009, 09:22:03 AM »

did you change your fuel filter with the pumps??? clogged filters will cause the pump to fail.

charlesmarseille · « **Reply #3 on:** April 11, 2009, 12:51:13 PM »

yep filter is brand new. lines are good all the way to the engine, i changed the fuel lines between the hardline and the fuel rail too. (those 1'' long hoses) might it be my FPR? or an unopening injector, caused by a bad ECU? thanks guys again.

charlesmarseille · « **Reply #4 on:** April 11, 2009, 12:53:34 PM »

guys i really need some advice here, ive gotta work tonight and theres no other way than putting fuel to my m42! Im sure you guys know why usually fuel pumps fail!

charlesmarseille · « **Reply #5 on:** April 11, 2009, 12:55:13 PM »

UPDATE: i just tested my third fuel pump, and when connected directly to a battery, it clicks when i put voltage on it. and clicks again when i remove voltage. but it doesn't operate.

charlesmarseille · « **Reply #6 on:** April 11, 2009, 01:09:27 PM »

doh, i just read that its bad to run a new pump with less than 1/2 the tank, i was about 1/3 and the pump failed at about 1/5. might be that.

charlesmarseille · « **Reply #7 on:** April 11, 2009, 02:07:56 PM »

by the way, fuel filter goes this way right? IN: from tank OUT: to engine

B318M42W · « **Reply #8 on:** April 11, 2009, 08:27:25 PM »

the IN is from where the fuel is coming from and out it to engine. oh and did you check to see if your CPS (crankshaft Position Sensor) is still good??? those sensors are a pain when they as they won't allow the fuel pump to work. search the forum for info on how to test it. there's LOTS of threads about it.
best of luck!

charlesmarseille · « **Reply #9 on:** April 11, 2009, 09:15:24 PM »

just replaced it, and UPDATE: i hit my two last pumps with a rubber mallet and they now work, took a little wiggling with the battery to make them work, but eh, it works now! so I guess i really need to full my tank about 1/2 to make my pump cold enough. so guys: keep some gas in your beast, will save you 150 bucks! ill get back to you in a week to make sure thats the ''fix''

Jimmy Lewis · « **Reply #10 on:** April 11, 2009, 09:57:41 PM »

You don't need 1/2 a tank to cool your pump, it just needs to have fuel running through it period. I had an issue exactly like yours, where the fuel pump died, I replaced it and then the car started acting like the fuel pump died again. It was the CPS, the sheathing gets worn and the sensor becomes intermittent. Though it does sound like you got it running again, but if it gives you any more similar issues look into it. I thought I had my problem solved numerous times, but every couple of days the sensor's signal would start going out and the car starting running as if it was out of fuel. Good luck.

charlesmarseille · « **Reply #11 on:** April 13, 2009, 01:09:47 PM »

ho! thanks jimmy, ill try this out since my car doesnt run anymore like you said! god da*N it! but i love it so ill check the crankshaft pos sensor

charlesmarseille · « **Reply #12 on:** April 13, 2009, 01:11:51 PM »

but he, all my pumps died, they dont just seem like they died, they actually did, so i tried testing the relay by jumping 30 and 87 and fuel pump relay and I hear a fuel noise from the return line after the fpr. And this doesnt sound good, its really loud. could this be a bad fpr??

charlesmarseille · « **Reply #13 on:** April 14, 2009, 01:59:40 PM »

by the way, i dont get a check engine light for the cps sensor. i checked it, checked the omhs, no prob seemingly. what else could it be? what would cause a fuel pump to fail? all the little theets from the showing sprocket from under the pump broke on the three pumps. does this means its got too much pressure or not enough or the motor gets too much power or not enough?!?PLEASE!

B318M42W · « **Reply #14 on:** April 14, 2009, 05:17:58 PM »

do you get full pump assy (with the mount and the strainer, ect) or just the pump itself??? i'd check the bottom of the fuel tank for sand/ debris, and also your strainer for crap. check if your fuel lines are clogged (both ways, TO the engine and the return line.)
best of luck!