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Old 04-21-2009, 09:38 AM   #1
W2WDETAILING
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so im about to change my fuel pump..and

i go to my car look at the old fuel pump and i get very confused then i realize the po put the early e30 pump in and blocked off the return line... i knew it wasnt possible because i allready replaced the return line

but hey if you only have access to an early pump i guess this works too
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Old 04-21-2009, 11:09 AM   #2
InfiniteDice
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Some of the earlier in-tank pumps are transfer pumps only. But you probably know that.
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Old 04-22-2009, 12:20 AM   #3
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Some of the earlier in-tank pumps are transfer pumps only. But you probably know that.
Well E30's up to end of 1987 had 2 pumps and 88 and up have only one in tank pump.

But this is crazy, this is a 1990 e30, so one pump but it needs a return line or else the fuel pressure with go high since there is no return
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Old 04-22-2009, 01:08 AM   #4
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Well E30's up to end of 1987 had 2 pumps and 88 and up have only one in tank pump.

But this is crazy, this is a 1990 e30, so one pump but it needs a return line or else the fuel pressure with go high since there is no return

yeah ok you lost me there ofcourse it needs a return line but it goes directly into the tank instead of going into the top of the pump if that helps explain it. but the po used a 88/89 pump im guessing and blocked the return because it has a return in the tank.
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Old 04-22-2009, 01:41 AM   #5
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so is it running good with the new pump???
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Old 04-22-2009, 01:55 AM   #6
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so is it running good with the new pump???
yeah and it fired right up before i had a bit of lag when i would give it gas now it seems pretty percise. my old pump had a funny fitting sometimes the car wouldnt start unless i jiggle the connection thanks for the pump riche
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Old 04-22-2009, 01:58 AM   #7
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yeah and it fired right up before i had a bit of lag when i would give it gas now it seems pretty percise. my old pump had a funny fitting sometimes the car wouldnt start unless i jiggle the connection thanks for the pump riche
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Old 04-22-2009, 03:02 AM   #8
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So your saying that you replaced the fuel pump and it is working great!

My question is : Did you connect the return line from the fuel rail back into that hose...

See the way it works, this is a in tank high pressure pump which pumps fuel to the fuel rail and the fuel pressure regulator on that rail will give you a constant ~43psi and what ever is too much coming from the pump, will return to the gas tank.
A fuel injection pump will certainly give you alot more than the needed fuel in the fuel rail for the injectors and that is why you have a "FPR" fuel pressure regulator.

Now i sure would like to see what you got at the end of the fuel pressure regulator where the return fuel is suppose to go.

I guess at this time if the fuel pressure regulator is blocked, your running at the fuel pump maximum pressure.

Anyway you should investigate further into this, specially if you have replaced the pump...

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yeah and it fired right up before i had a bit of lag when i would give it gas now it seems pretty percise. my old pump had a funny fitting sometimes the car wouldnt start unless i jiggle the connection thanks for the pump riche
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Old 04-22-2009, 03:13 AM   #9
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READ the thread - he has a return - it goes back to the tank, not the pump. It was the wrong pump for year of car and someone has simply blocked off the return as it is not needed at the pump - it goes directly back to the tank
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Old 04-22-2009, 03:50 AM   #10
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OH GREAT AND THANK FOR PUTTING IT IN BIG LETTERS ECHO
you woke me up

I completely MISSED that part of the thread...I was so trying to figure out how this car could still run without a return line...that i went right past that line.
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Old 04-22-2009, 09:23 AM   #11
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OH GREAT AND THANK FOR PUTTING IT IN BIG LETTERS ECHO
you woke me up

I completely MISSED that part of the thread...I was so trying to figure out how this car could still run without a return line...that i went right past that line.
ahah well now im awake too... ofcourse i have a return line
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Old 04-22-2009, 01:34 PM   #12
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yea
Weird that they had a line going to the tank instead of using the right return location...no matter which pump you use,transfer or high pressure pump, early or late pump, they all look the same in there and the tube that is blocked off is for fuel return to the tank....
but as long as your ride is running like it should, that's what counts.
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Old 04-22-2009, 02:28 PM   #13
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yea
Weird that they had a line going to the tank instead of using the right return location...no matter which pump you use,transfer or high pressure pump, early or late pump, they all look the same in there and the tube that is blocked off is for fuel return to the tank....
but as long as your ride is running like it should, that's what counts.
ok wow you lost me ..i have a feeling your still confused. here let me show you a picture of the new"er" pump
ok the first picture is the early model pump in a late model e30

the second picture the late model pump is in the late model e30 the way it should be
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Old 04-22-2009, 06:31 PM   #14
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He He don't mind me.....
This is the perfect picture for this model....man that gas tank looks pretty clean. No rust around the pump Unit whatsoever.
Has it been replaced?
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Old 04-22-2009, 07:08 PM   #15
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He He don't mind me.....
This is the perfect picture for this model....man that gas tank looks pretty clean. No rust around the pump Unit whatsoever.
Has it been replaced?
as far as i know thats the original gas tank.
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