Ran out of gas,Now wont strat.1992,740 wagon

Post by **billofdurham** » 27 Feb 2007, 12:17

I do not see a pump.I do have a large can type inline filter under the drivers seat.

The '92 should have two pumps. The main pump is located on the right rear side of the vehicle under the rear seat.

Have you checked the fuses? #1 is for the main pump and #11 is for the tank pump. If one of these has gone you will not get enough fuel pressure to keep the engine running as it does depend on the two pumps.

If you are still looking for pictures on replacing either or both pumps let us know as I can dig some up.

Bill.

dw601 · Post by **dw601** » 27 Feb 2007, 12:58

Bill,,,thank you for that info,but I just looked under the right rear seat,and didnt see anything...
If you could,,,some sort of diagram would be helpfull...I may have bought the wrong pump...

Check back in a bit

DW

dw601 · Post by **dw601** » 27 Feb 2007, 13:08

I checked and I do have 2 fuses,,#1 is a 30amp,it's good,,and #11 is a 15amp,,it's good..

Does the link I posted look to be the correct pump for the tank?

I will have to get the other one if it has 2 huh?

DW

Post by **billofdurham** » 27 Feb 2007, 15:52

Does the link I posted look to be the correct pump for the tank?

It certainly looks like it. This picture shows it with the sender unit attached.

The main pump should be sitting inside a cradle which sometimes makes it hard to see.

Hope these are of some help.

Bill.

dw601 · Post by **dw601** » 27 Feb 2007, 16:30

TY Bill,,
Very good to have something to look at..lol

I'll tie into this thing in the morning..I sure didnt see the main pump there thu,just a filter...well,I'll be better to see it in the morning..

Again,,,TY

DW

Kmaniac in California USA · Post by **Kmaniac in California USA** » 27 Feb 2007, 17:03

Hello Again:

The picture of the in-tank pump looks like the one I put in my 740. Yes, you need to get a new filter sock. Reusing the old sock or not using one at all will destroy both the pumps prematurely.

Before you go any farther, did you check the integrity of the fuel pump relay? The one relay on the relay board controls both pumps. Check it first, just to make sure you're not going in the wrong direction.

Contrary to logic, your car will run with just the main pump only. I know, because I found my in-tank pump fuse blown a few days after buying my 740. If fact, once both pumps were replaced, I purposely pulled the in-tank fuse and the car ran just fine.

In these two-pump fuel systems, fuel passes through the in-tank filter sock, then the in-tank pump, then the main pump, then the main fuel filter before entering the engine compartment. The main fuel filter is replaced at regular service intervals, but the filter sock in the tank is never replaced routinely. Here is what happened in my 740. After 19 years, two holes appeared in the filter sock. This allowed gas tank sediment to enter the fuel pumps. The sediment burned up the in-tank pump, causing the fuse to blow. Then more sediment began to foul the main pump, causing it to intermittently stick, causing the car not to start at random times. I believe that this inconsistent starting problem influenced the previous owner to dump the car cheap on an unsuspecting buyer (me). This car caused me great frustration for three weeks until both pumps and filter sock were replaced (for more details, read my posts). Since then, the car has started everytime.

I believe that this problem is more common than most people might think. I have read more than one post in this forum about people who suffered from a bad fuel pump and they took their car to an ignorant mechanic who replaced only the main pump. Then, every 30 days, they would have to replace the same pump again and couldn't figure out why the replacement pumps were always failing. I am sure many a good car was junked out of frustration for this very same problem.

Anyway, good luck with the repair.

dw601 · Post by **dw601** » 28 Feb 2007, 10:59

TY again Chris for your reply.Is the relay behind the ashtray? I will take a look.I do hear 2 clicks when the key is switched on.

As a side note,,All this trouble from running it out of gas...Go figure..lol

DW

Post by **billofdurham** » 28 Feb 2007, 12:03

The relay is on the main relay board behind the ashtray. It is in position E which is second row, far left.

If the in-tank sock was holed then running out of fuel would pull major amounts of sludge into the system. To be on the safe side replace the main filter as well.

Bill.

dw601 · Post by **dw601** » 28 Feb 2007, 12:37

OK,,,Well I have had some success.
I now know that it only has 1 pump.It is in the tank.I called the dealer with the VIN#..They say Rigina system.
Now what they cant tell me because the parts guy's info wasnt clear on this.Is the position of the access panel in a wagon.Is there any of you guy's with the proper books or something to tell me where it is.I have pulled the back seat forward,and I dont see it..Is it possibly under the rear cargo floor?
I have a bunch of stuff back there and dont want to remove it if I dont have too.
I have also pulled the carpet up,and I dont see it there either..

Thank You for looking,and If anyone has a book with the wagon listed would you look for me please?

DW

Kmaniac in California USA · Post by **Kmaniac in California USA** » 28 Feb 2007, 13:32

Regarding the fuel tank access hatch, I can't speak for the wagon, but in my sedan the hatch is between the rear wheels on the drivers side. I suspect in the wagon it is between the rear wheels in the cargo area. Sounds like you will have to unload the rear.