Question about 1988 Volkswagen Cabriolet

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Two fuel pumps???

A friend of mine has a 1988 vw cab. conv. which seems to be having a fuel problem. It jerks and jumps like it's clogged. i suggested that the fuel filter be checked and if needed changed. Also injectors supposedly checked and cleaned. now also supposedly the fuel pump was replaced, but he is telling him that there is an internal and external fuel pump. (two fuel pumps?) I was always told the fuel pump was in the gas tank and the tank had to be dropped and emptied to change the fuel pump. Please help! Who is right and do you have any other suggestions? Thx, Cathy from (KATHY'S KARS) Col. Bch. VA.

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  • Ned C Cook
    Ned C Cook May 11, 2010

    Does this happen before the engine is warmed up? orwarmed up a cruising? Always change the fuel filter before anything else. It maybe a two pump syste but the reasoning isn't there. Filters usually bother you on demand, fuel pumps usual;y are go or no go. Good luck Kathy and keep me informed.

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The 88 Cabrio has 2 fuel pumps and 2 fuel filters as well. One filter next to the main fuel pump and another under the hood next to the air filter. The transfer pump in the tank is easily acsessed under the back seat by an access panel with 3 screws. The Transfer pump has a screen which is notoriously clogged. The Main pump is on the frame on the passenger side mounted in a rubber casing. Both pumps can be tested by wiring the terminals straight to a battery. Check your relay and fuse first. The fuse is the 5th from the left and the relay is the 2nd from the left in the first row.

Posted on Jan 06, 2011

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Very often the car can have 2 fuel pumps, one in the tank known as the prepump and one along the frame as the main pump. Accses to the in tank pump generally(as of late) does not mean dropping the tank. Sometimes under the carpet above the tank inside the car ther is an acsess panel. Other times you can "chinese puzzle it out. Have someone put their ear to the filler on the tank(cap off of course) and just turn the key on to fun, not start just till all the lights come on. Do this three times a 2 second buzz should be heard each time if not you'll need a in tank pump.Assuming you've checked all the fuses!!!

Posted on Jul 25, 2009

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VW CISe typically has two pumps. One in tank to supply pump under car. Because injection head requires 85-90 PSI, and suction subtracts from output, 2 pumps are used. Hi-press pump is right next to filter. You may want to check pressure regulator (warm-up regulator) bolted to front of engine. Holds pressure down, goes bad frequently.

Posted on Jul 25, 2009

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There are two fuel pumps on the vechile one is internal that sits in the tank and u can access it from the back seat and there is a external under the car.Take the car to a pro vw mechanic becaucse the parts are not cheap and it could also be the injection box under the hood good luck.

Posted on Aug 05, 2009

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