55 L tank question

[Smrtpunk]

I'm in the process of rebuilding an 86 325 E.

Of that rebuilding I had to replace the tank. My question is my car does not appear to be equipt with an external fuel pump. The pump for the car is in the main sender unit that is sharing the space with what I presume is the fuel level sender.

The engine is a 2.7i and I couldn't be happier with how it runs. However, it doesn't take fuel when I'm trying to fill it. It back's up constantly. Everything appears to be hooked up to the canister behind the pass wheel. If I dont mind going on/off every second it will take its fuel. Tonight just for a test, I removed the vent hose (big one) from the tank and tried a fuel up. It started taking the fuel pretty well and then burped up some gas through where the hose was so I stopped and put the line back on.

Would it be possible for my car to have the M20B25 setup in a 55 L tank and do you think this could be attributing to my fuel backing up issue?

Here's a pic

[efficient]

i think the 2nd fuel pump is outside on the drivers side by the rear driver side wheel.

[Smrtpunk]

i think the 2nd fuel pump is outside on the drivers side by the rear driver side wheel.

There is no fuel pump next to the tank. I believe there are some cut wires around that area, but no pump, just a fuel filter

[jlevie]

The pump shown is the standard low pressure transfer pump. The high pressure pump should be above the fuel filter under the car just ahead of the left rear wheel.

The difficulty in fueling the car means that there is a problem with the tank's vent system. part of the system is in the rear of the right rear fender well and the remainder is the charcoal canister in the engine bay.

[Smrtpunk]

The pump shown is the standard low pressure transfer pump. The high pressure pump should be above the fuel filter under the car just ahead of the left rear wheel.

The difficulty in fueling the car means that there is a problem with the tank's vent system. part of the system is in the rear of the right rear fender well and the remainder is the charcoal canister in the engine bay.

There is no pump above the fuel filter.

I'm going to check the canister/expanision tank lines. Hopefully, I'll find a plugged line or something. Do Canisters require maintaining? Could it be plugged?

[efficient]

There is no fuel pump next to the tank. I believe there are some cut wires around that area, but no pump, just a fuel filter

hmmm you should post pics :-D

[jlevie]

There is no pump above the fuel filter.

I'm going to check the canister/expanision tank lines. Hopefully, I'll find a plugged line or something. Do Canisters require maintaining? Could it be plugged?

A prior owner could have replaced the in-tank transfer pump with an aftermarket high pressure pump (using the original pump bracket assembly) and eliminated the external high pressure pump.

No maintenance of the overflow or charcoal canister is normally necessary. Though you could have a blocked or pinched hose.

[Smrtpunk]

A prior owner could have replaced the in-tank transfer pump with an aftermarket high pressure pump (using the original pump bracket assembly) and eliminated the external high pressure pump.

No maintenance of the overflow or charcoal canister is normally necessary. Though you could have a blocked or pinched hose.

I found some skematics of how the exapansion tank is plumbed and I cross referenced it with how mine was run and it appears as though the lines on the top were crossed. Unfortunatley, when attempting to remove factory clamps I damaged the nipples on the unit itself. I used some JB Weld epoxy to try and paste everything back together and will try it out tonight.

Here's the pic I'm using to cross reference with.