3-Series (E21, E30)Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.
I removed the fuel pump on my 87'325es the one under the car. Is fuel supposed to out from the hose coming from the tank? because it is'nt. What is that round filter looking thing which is attached to the fuel pump with a small piece of hose? Is that a strainer? How does the intake fuel pump work? The reason for all of these questions is I cant get any fuel in the lines going to the engine. Sitting for a few years.
There is an accumulator before the main pump (external pump), then there is a anti-pulse diaphragm after. That pump is main pump, the transfer pump (internal pump) is what feeds that. The transfer pump is in the tank (where the strainer is), you'll find it's access plate under the rear bench seat on the passenger side. If the car has been sitting up for a while there is a good chance that the tank is full of gunk.
You can buy a fuel pump for a 90 325I and do away with the large external pump. But I can't remember the part number off hand.
I changed the internal pump already. Today i took out the external pump and hooked it up to a battery and it works. But I cant determine if the internal pump is working or if im getting current there, the fuel level unit works it shows it on the cluster that it is a 1/4 full so the level thing is working.. When I took out the external pump the hose that connects it to the tank is not leaking down fuel. Is that the problem that not enough fuel is bening sent to it? When I removed it the two wires that are connected to the pump on its end I touched them together and saw no sparks does that mean there isn't any current? Is the strainer in the tank? Does that have anything to do with no fuel coming through that end of the hose which goes to the external pump?
Your fuel pump relay is located just before the strut tower on the drivers side. (it's not in the fuse box) There you'll see 3 relays (they often have a black plastic cover on them) The one it the middle of the 3 is the fuel pump relay.
Yes and there should be fuel comming out. Check for power at the transfer pump. Remember the oval tube held in with 4 nuts is not your fuel pump, that is your fuel level sending unit. Make sure that the plug is tight and clean.
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