> Correct. There is a “snap switch” that reverses the pump...
By 1991 the Hella snap-switch pump was long gone, and the pump has much more
electronics in it, and a bidirectional motor/pump. There's a pressure/vacuum
switch
that turns off the pump once it has pumped 'enough', and there's a timer
Correct. There is a “snap switch” that reverses the pump so that in one mode it
supplies pressure (unlock) and in the other mode it supplies vacuum (lock). It
also has a time out function if maximum pressure or vacuum isn’t met. If that
occurs, it won’t “flip” to the other mode, making it lock a
This is a model that can produce both vacuum and pressure: Mityvac MV8510
Silverline Elite Hand Pump. Looks like they are about $60 on Amazon, you
may be able to find it sold locally and get it today. Make sure you get
one with the switch so you can test both vacuum and pressure.
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M
I agree with Manfred. Did you test the circuit for the fuel door with a
MityVac or a similar tool?
Isn't the pump on this car a dual action pump, which produces either vacuum or
pressure as required? That is how my '87 124 wagon works, as well as my
younger 124 cars. If that is true, then yo
If this is the same system as the one on my daughter's SD, the
pump locks and unlocks both the doors and the gas door. So if the
doors lock and unlock then the pump is not your problem.
If the tubing is good then the next place to look is the air pod
for the gas door, or there could also be a
Thanks to Dan for your suggestion. I managed to open the fuel door.
The re is no air leak anywhere in the tubing as Max mentioned. I am
suspecting the vacuum pump in the trunk has gone south.
Anyone have a good vacuum pump laying around? This model has an orthopedic
driver's seat.
PM me if you ha
