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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E36 (1991 - 1999)

E36 (1991 - 1999)
The E36 chassis 3-Series BMW was a huge hit among driving enthusiasts from the first moment the car hit the pavement. The E36 won numerous awards over the years it was produced and is still a favorite of many BMW enthusiasts to this day! -- View the E36 Wiki

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  #126  
Old 09-20-2012, 04:08 PM
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Pulled off the cover to get to the in tank pump, then removed the fuel lines. I noticed the smaller one was the return, and the larger the feed. Then I tried to start the car and fuel came out of the pump side, , the hooked a gauge up to read the pressure and it didn't really read much (supposed to be 5psi or so)



Now today I can't get anything to come out of the pump, however the in line pump is sucking fuel through it, allowing the car to run (with low fuel pressure)



Took the in tank pump out, tried to jump the positive and negative with my car batterie, pump didn't make a noise. Is there a better way to test it? I switched up the cables and still nothing.



I assume this has been the problem all along but I don't see why it would pump then stop working all together.
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  #127  
Old 09-20-2012, 05:17 PM
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  #128  
Old 09-20-2012, 05:27 PM
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Find me a cheap one? lol
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  #129  
Old 09-20-2012, 06:53 PM
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Quote:
Originally Posted by FenderBender View Post
Find me a cheap one? lol
i'd probably get a walbro unit for a 91 318is, like this thread suggests...

http://forums.bimmerforums.com/forum....php?t=1798324




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  #130  
Old 09-20-2012, 07:26 PM
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I like that idea, thread seems kinda vague though.


Did I test the fuel pump right? Why would it just stop working?
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  #131  
Old 09-20-2012, 07:29 PM
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yes. if you put a guage inline between the pump and the fuel rail (and the secondary pump...) and got low fuel pressure. did you find the spec?? i would imagine that 5psi is a bit on the low side....


and ken already answered the next question...




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  #132  
Old 09-20-2012, 07:33 PM
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I meant tested the pump by putting power to it, to see if it does anything.


Fuel pressure in the video is low, 30 couple PSI when it should be 40 couple running.


The 5 psi rating was for the in tank pump only.
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  #133  
Old 09-20-2012, 07:47 PM
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powering up the pump shoul operate it. check for an open in the windings.

5psi is the reading, or spec for the supply pump??

it can be a low pressure like that, but have waaaay more volume, which is probably what is lacking. especially if it isn't engaging now...



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  #134  
Old 09-20-2012, 08:07 PM
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5psi is the spec, didn't seem to flow a whole lot, and pressure wasn't too high.


Trying to find info on retrofitting other pumps, but find a whole lot of speculation with no backup. Some say 91 318 pump, another dude says some Walbro and another says the Chevy 4.3 pump.
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  #135  
Old 09-20-2012, 08:07 PM
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Open in the windings? What? lol
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  #136  
Old 09-20-2012, 08:25 PM
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Quote:
Originally Posted by FenderBender View Post
5psi is the spec, didn't seem to flow a whole lot, and pressure wasn't too high.


Trying to find info on retrofitting other pumps, but find a whole lot of speculation with no backup. Some say 91 318 pump, another dude says some Walbro and another says the Chevy 4.3 pump.

apparently the 318is from 91 is a drop-in unit. plug-n-play. no fuss no muss.

probably a bit pricey, which is why someone suggested a 4.3 fuel pump. however, from what year?? votec or non-vortec?? dunno...but will hafta be squeezed on the fuel pump assembly. not too difficult to do if you know how. most fuel pumps are of similar vane type design.

but i'd suggest walbro, as they are some really nice pumps. i'd get the unit for the 91 318is. (hint, you could compare this unit model # to the 4.3 unit to see if they are the same...)



Quote:
Originally Posted by FenderBender View Post
Open in the windings? What? lol
open circuit. the windings would have a break in them, so you would have an 'open circuit', as in 'not connected'...the dvom would read 'OL' on the lcd display for 'outside limits'.

no current will flow through an open circuit, thus not creating the proper magnetic field necessary to operate said electrical component.


knowutahmeen??



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  #137  
Old 09-20-2012, 08:30 PM
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Gotta do some more research, looking to do this for the cheapz.



Take a look at the pump here :

http://www.ecstuning.com/BMW-E30-325..._Pump/ES37328/


Where should I put power and ground to see if it's working?
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  #138  
Old 09-20-2012, 08:44 PM
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just use your dvom across the pump terminals, auto range setting, and see what shows up...if open circuit, you could put enough juice to it to melt rocks, it won't pump.

if you do have a reading, then try to put power across from one side to the other. any 12v source would work, just use a fused jumper.

if you happen to get the hot and cold crossed, it'll still pump, but backwards.



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  #139  
Old 09-25-2012, 05:30 PM
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Alright, pump retrofit. Got a 91 318is pump from advance. Wanted the whole assembly but only had the pump and filter.










All finished, until you realize the pump is a hair too long.



So I trimmed the tube a little bit.



Finished for the second time.




Of course in between this I realized the wiring instructions were incorrect hence the wires were backwards and the pump turned into a vacuum lol.

Line to delete the in line pump.











Now, problem not fixed. The pump is working great, but just watch this quick video please.







Now think about this, may be the problem:


Old return line went into the filter that's on the fuel pump. I have the new one going straight into the tank since the setup is a little different. Would that allow the fuel to return so quickly like it is? I can find absolutely ZERO leaks anywhere.
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  #140  
Old 09-25-2012, 07:52 PM
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the fuel pump will pump out at one rate, it's the fpr that regulates the rail pressure.

deadheading the pump (clamping the return) caused it to do jump up in pressure, which looked normal to me.

what *didn't* look normal to me was the pressure dropping like it did.

redo the test, clamp pff the return line, and see what happens.

if it drops again like that then you have a faulty check valve on the pump.


does it still not run properly??



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  #141  
Old 09-25-2012, 08:01 PM
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I did it with the return line clamped, same thing. Nope ran the same.

Where is the check valve? like the pump is junk?

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  #142  
Old 09-25-2012, 08:13 PM
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yeah, if you clamped the return line and chut the car off and the fuel pressure fell, that indicates a faulty check valve in the pump.


but it should still run with that much fuel pressure...i don't get it.

it's not running at all?? or only will idle when the return line is clamped??

with the fuel pump not holding pressure like that it's not possible to perform a flow test on the injectors, which would be my next test.


sux. wish i were closer, tho, i'd love to be able to give you a hand with this...













































i'll have mondays off in november....


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  #143  
Old 09-25-2012, 08:25 PM
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Well it did the whole won't run for a while thing. It did start but slowly idled down and died. I don't remember the fuel pressure but I believe it was still low, like 30s.

Question, would a big vac leak cause the engine to not produce enough vacuum and make the fpr think the engine is revving up causing it to release fuel pressure?

Or would the faulty check valve affect the running fuel pressure?

Come over here and fix this pos lol.


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  #144  
Old 09-26-2012, 03:04 PM
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6 pages in, no progress. Runs EXACTLY the same as before, however some things to consider:


Here is the old fuel filter that goes on the pump compared to the new one. The old one had the return line feed back into the filter, maybe raising the pressure slightly since it will be some sort of resistance? Or am I crazy? I think I'm going to return this pump and get the whole 91 318is assembly to just drop in since this check valve isn't working anyway.









I also Ohm'd the injectors and they were all perfect.



SO CONFUSED!!!!!
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  #145  
Old 09-26-2012, 06:18 PM
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When you get yours running, come work on mine.......

http://neworleans.craigslist.org/cto/3279982235.html


(kidding, but I wish I had it)
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  #146  
Old 09-26-2012, 06:34 PM
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Steal! I'd buy it!


But Ken, what's wrong with mine??

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  #147  
Old 09-26-2012, 06:40 PM
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I don't see it?... Needs paint and an engine.
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  #148  
Old 09-26-2012, 06:41 PM
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This thread is enough to deter me from ever considering to buy an E30 318.
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  #149  
Old 09-26-2012, 06:42 PM
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This thread is enough to deter me from ever considering to buy an E30 318.
Lol, me too. At least an M10 e30.
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  #150  
Old 09-26-2012, 06:44 PM
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It's gutta be something stupid!

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