Question about 1995 Saab 900

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1995 Saab 900 Won't Take A Fill Up

My daughter's '95 Saab 900 was running on empty last week so I attempted to fill it up with gas but the darn thing would only take a few gallons before the pump clicked off. I adjusted the pump thinking it was jammed in the tank incorrectly, but after several tries it was clear the gas pump was convinced my tank was filled to capacity, when in fact it had about a half-a-tank. The fuel gauge and the fuel range l.e.d display seem to be working fine. Any information you may have would be greatly appreciated.

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  • kbauer1958 Feb 02, 2009

    I have investigated further and it appears this is simply a gas tank vent hose issue. My friends theory is that the vent hose is clogged. So, who knows how to troubleshoot this?

  • kbauer1958 Feb 12, 2009

    Hey Ponderguy, Solution # 2 seems to have nailed it. I'll take a look.

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Sorry if this gets posted twice. I have a 95 Saab 900, which I just acquired. I can get only about 4 or 5 gallons in at a time. The best analysis I found was this one where the man pinpoints a stuck valve in the gas tank, and tells of what he did to address it.: http://www.quasimotors.com/9_5_gas_fill_prob.htm

Posted on Feb 09, 2009

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Sometimes the fuel tank fuel level sending unit goes bad. You could have a full tank but the car believes it only has a little bit. The computer bases its range to empty based on information from the fuel sending unit. The onboard computer is probably fine but it probably providing faulty output data based on faulty input data from the sending unit.

Suggest trying a different gas pump nozzle at you gas station and try to fill the tank, listening for the sound of the gas coming up the fuel filler neck which in turn contacts the shutoff in the gas nozzle. When you think the tank is full, you could use a wooden(i.e. non-metallic/non-sparking) dowel as a "dipstick" pushed thru the nozzle restrictor down into the fuel filler neck. If the tank is full enough to shut off the gas nozzle and your wooden rod is longer than the gas nozzle, you should get gas on the wooden rod which proves the tank is full. This will indicate that the fuel sending unit is probably faulty. At that point, you pay to replace it or fill the car and use the trip odometer to tell you when to fill up (e.g. say every 300 miles). The trip odometer method relies on you zeroing the trip odometer when you fill the tank(no partial fillups). Motorcyclists whose bikes do not has gas gauges use this method. If the tank runs out of gas, the fuel pump can burnout.

Posted on Jan 24, 2009

  • HalfmoonUSA Jan 24, 2009

    Another thought is that sometimes a gas nozzle tip is angled toward the side of the fuel filler neck or if the gas is being pumped at a too fast flow rate will cause the gas to splash back forcefully enough to shut off the nozzle.

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Posted on Jan 02, 2017

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