I have a 1985 VW Cabriolet that has been sitting for a while. The inside of the fuel tank is coated with what looks like oil/grease residue. There is also deteriated hose pieces and small particles from a hose that was on the sending unit, all of which was clogging the fuel pumps and injectors. Anyone know of a way to clean out the tank while it is installed? Otherwise, removing the tank will be a real project. Has anyone done this before? It appears that you need to drop the rear axle (front wheel drive), disconnect part of the exhaust pipe and muffler as well as disconnect the fuel pumps and a filter.
You are correct sir. not too easy to drop. if your tank isnt too bad you can try removing your back seat, opening the tank via sending unit cap(twist to left with large pliers) and pouring in a gallon of parts cleaner.(acetone methanol toulene) let that sit for a while and drain via hand pump(no drain...genius!) i suggest dropping it. if it has sat a while there is a chance for rust. you may notice bubbles under the black paint...this is a sure sign.begin by removing your exhaust,a recipricating saw should do the trick.sorry gonna have to weld that back.drop the rear suspension by unbolting the two bolts on both sides closest to the front.put some bricks under it or something to hold it up but let it drop as far as you can. get all of the brake lines,and fuel pump ,accumulator,filter, and hoses out of your way and just pull it right out.try not to curse. easy as that.
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Hi. This is more of a fuel filter issue than a pump issue although, a bad fuel filter will eventually destroy a fuel pump. When the filter is restricted or clogged, this will tend to work the pump harder than normal. this will over heat the pump, therefore, shortening its life span. I recommend replacing the fuel pump and filter and, adding a fuel additive like techtron fuel injector cleaner/water remover as well.
it sounds like either the primary or secondry fuelpumps, take of the fuel line in the engine bay get some one to turn over the engine if no fuel is being squirted out of the pipe then its one of the pumps, check the pumps fuses and relays first, or could simply do with a drain and a good flush.