FUEL TANKS

This belongs under the EXTERIOR chapter but since it's more engine related, I'll put it here.
Several different tanks were installed, depending on equipment and/or production year.

INJECTION vs CARBURETTORS
- All carburettor engines have a block mounted mechanical fuelpump which suck petrol from the tank.
- All injection engines have an electric fuelpump installed inside the tank, which pressurize the feed-pipe.

FEED & RETURN PIPES vs FEED PIPE ONLY
- Carburetted B-engines have a fuelpump with a built-in pressure regulator, and therefore no return pipe.
- Carburetted H-engines have a "constant-flow" fuelpump, and therefore needs a return pipe.
- All injection engines have a return pipe.

2-DOOR vs 3-DOOR vs 4-DOOR vs 5-DOOR
2/4-door 99 saloons have the tank-filler on the left rear wing. The large filler-hose enters the tank at the left side.
3/5-door 99 hatchbacks, the Saab 90 and all 900's have the tank-filler on the right rear wing. The large filler-hose enters the tank at the rear, under the boot's "basement-lid".

STEEL vs PLASTICS
In 1979 steel tanks were discontinued and plastics introduced.
In 1981 the 900 saloon was introduced. It had a rear floorpan with a new shape, so the tank could be made larger. In the name of rationalizing, Saab changed the rear floorpan in the hatchback aswell, that year.
2/4-door 99 saloons kept the old floorpan, but the plastic tank is still a little larger.

SUM UP
Confused? Not after this! Here's a guide to which cars need which tanks, when installing K-jetronic injecton.

A 2/4-door 99 will need the tank from a:
- m75 or later 2-d LE.
- m75 or later 2-d EMS.
- m76 or m77 GLE.
- m79 or m80 Turbo. (Plastic)
- m80 or m81 GLi. (Plastic)

A 2-door 90 will need the tank from a:
- m81 or later 900 with K-jetronic injection. (Plastic)

A 3/5-door 99 will need the tank from a:
- m75 or later 3-d LE.
- m78 or later 3-d EMS.
- m78 GLE.
- m78 Turbo.
- m79 or m80 900 with K-jetronic injection. (Plastic)

m77 99 EMS. STEEL	m77 99 saloon. STEEL	m79 900 GLs. PLASTIC, old shape	m80 900 GL. PLASTIC, old shape	m80 99 saloon. PLASTIC
m83 900 turbo. PLASTIC, new shape