Jump to content
  • When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.

Fuel Tank - Return Line


Recommended Posts

I'm in the midst of the M20 conversion and just realized that I don't have the "protruding hard line" on the fuel tank for the fuel return. Can I simply drill a hole in the tank then weld a hard fuel line with a 90 degree bend onto the tank?

I've been searching the forum for pics of tanks but have had little luck. If anyone has another suggestion, please let me know.

You can see the difference of the tanks on realoem:


Attached is a pic of my tank (poor quality, taken with phone). But as you can, see there is no return pipe on the tank next to the pump...


Link to comment
Share on other sites

I am in the process of converting my 02 to fuel injection and I got an intank fuel pump from a 318i or 325i, can't remember, but it has a return fuel pipe built in to the top flange. I have read on other post that it will fit the 02 tank. I would not weld on the fuel tank, it can be very dangerous even after washing the tank out. I've heard of it being done if you have an inert gas fill the tank like argon or CO2, but it's still risky.

71 2002 - Sold  :( 
63 A/H Sprite
73 MG Midget

Link to comment
Share on other sites

You need a in tank pump/return/float from a 318is (1990-1991 E30 318is w/M42 engine, not the 318i model w/M10 engine). It comes with two pipes, one for fuel delivery one for return. Alternatively, you can have an extra pipe soldered (not welded) on the top of the pump in the picture, it should have a spot for the returned pipe but it is blocked off (soldered closed) at the VDO factory. Late model 318is pumps are identical to what you have but have the extra return pipe. Of course you can always weld a return pipe on the tank as a last effort.

Link to comment
Share on other sites

Updated info:

E30 318is (must be an "is" w/ M42 engine) - Cost $250:


Looks to me like an E30 325e will work as well - Cost $150:


e30 325 e pump is low pressure. youll need an aux pump in line

FAQ Supporting Vendor

Link to comment
Share on other sites

Just a tidbit of info here. Take a look at where the return line runs on the pump pictures. It goes to the bottom of the tank. If a return nipple is added to a tank, it should be a line that goes to the bottom inside the tank also. The Tii pick-up assembly is the same I believe with the return tube going to below the fuel level.

Reason is the falling fuel in the tank will cause a static charge and has the potential for ignition, maybe not in the tank but when you are about to fill the tank and take the cap off. A spark on the outside can blow the whole thing apart, and you too. Anyone around gas stations or around fuel storage tanks knows about the fill pipe.

A radiator shop is a good place to take a leak.


I have no idea what I'm doing but I know I'm really good at it.

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • BMW Neue Klasse - a birth of a Sports Sedan

    BMW Neue Klasse - a birth of a Sports Sedan

    Unveiling of the Neue Klasse Unveiled in 1961, BMW 1500 sedan was a revolutionary concept at the outset of the '60s. No tail fins or chrome fountains. Instead, what you got was understated and elegant, in a modern sense, exciting to drive as nearly any sports car, and yet still comfortable for four.   The elegant little sedan was an instant sensation. In the 1500, BMW not only found the long-term solution to its dire business straits but, more importantly, created an entirely new
    History of the BMW 2002 and the 02 Series

    History of the BMW 2002 and the 02 Series

    In 1966, BMW was practically unknown in the US unless you were a touring motorcycle enthusiast or had seen an Isetta given away on a quiz show.  BMW’s sales in the US that year were just 1253 cars.  Then BMW 1600-2 came to America’s shores, tripling US sales to 4564 the following year, boosted by favorable articles in the Buff Books. Car and Driver called it “the best $2500 sedan anywhere.”  Road & Track’s road test was equally enthusiastic.  Then, BMW took a cue from American manufacturers,
    The BMW 2002 Production Run

    The BMW 2002 Production Run

    BMW 02 series are like the original Volkswagen Beetles in one way (besides both being German classic cars)—throughout their long production, they all essentially look alike—at least to the uninitiated:  small, boxy, rear-wheel drive, two-door sedan.  Aficionados know better.   Not only were there three other body styles—none, unfortunately, exported to the US—but there were some significant visual and mechanical changes over their eleven-year production run.   I’ve extracted t
  • Upcoming Events

  • Supporting Vendors

  • Create New...