Hi all,

Interesting post about the loss of power so intermittently.
I started think of a failing AMM or throttle switch that changed information going to the ECU.
I don’t know if an AMM can fail intermittently though. Maybe a corroded pin on either one might be worth looking into.

Heck, maybe it’s a bad fuse to the pump itself I thought. Art has lots of experience with the tank pumps and circuits. There have been some horrible pictures of the tank tops from salt invasions.

With the a/c on, that would vary the heat gauge upwards probably the width of the pointer needle but the turning on of the heater core should have affected that back to normal.
With Having the heater on, when you didn’t need it, probably had you keeping your eyes on that gauge, I bet. (:). That is the thing to do when you see a warmed up gauge above normal to check if the radiator is not efficient enough or a thermostat issue developing.

If the ECU senses a heat issue way above normal it will adjust the ignition timing but a loss of power shouldn’t be one of them so far as the limp mode.

Now talking about a happenstances.
I was under my 1992 yesterday spraying on some under coating onto the underside of the footwells. I got a little bit carried away with using up two cans of the rubberized stuff.
When I got back towards the fuel pump, It was then, that I noticed that there was a Schrader valve stem sticking out at me from the inlet line to the main pump.
I had forgotten that I had seen it before shortly after buying the car from the Wagonmeister out here in California.
I know it’s not a standard thing for these to be on a Volvo so maybe he put one on or the previous owner, to him, install it?
It tap out looks to be nicely done. Maybe it’s an available standard part from someone in the Volvo world of modifications.

I think its a nice idea to have it so a person can conveniently check the output of the in-tank pump.
You know, Take a pressure reading or take the core out and see if the flow with bubbles or not.
It might help diagnose the rubber connector hose from sender to the pump. Especially with a lower filled up tank of gasoline too.


Did Volvo or the dealerships install these at one time?
The cap seems very much like the ones use on the fuel rails. Rather slim and tiny to grip but it sticks out so you can get on to it. Not like the stupid one on the fuel rail.

That’ll be it for my thinking challenge. (:-)

Phil