BIGRED
07-11-2007, 12:13 AM
I have started to work on replacing the fuel pump and the fuel pressure regulator.
Before heading into the tank, I wanted to be prepared to clean out any gunk in it. So the first step is to drain the tank. I read Bentley's and as usual it left me in a lurch. it gets close but is not exact, in this case about the various relays to jump to run the FP without cranking the engine. The diagrams and locations are WRONG.
That being the case, I spliced into the return fuel line at the point of the return line entrance to the tank, so that I could route the return fuel into a gas can.
Started up the car and went through the painfully long process of pumping the fuel into a can and pouring it into another car.
I noticed that at the point just before the reserve light came on, the stream of fuel started to have small bubbles as though it was sucking air. I checked and the car was almost perfectly level.
When the reserve light came on, the fuel stream went from flowing (with the bubbles) to a trickle to no flow to a slight flow and so on. I was watching the stream for a clear sign I had a pump problem. Pump seemed to be working fine up to this point.
I assume that the tank is near bone dry and that the sending unit isn't working as it should or there is a air leak in the fuel components in the tank (hose or plastic parts) above the current fuel level so that it is sucking air.
Assuming the tank is dry, when I get into the tank and remove the guts, I should be able to hook up the sending unit and try it out of the tank and see if there is a way to adjust it to make it more accurate.
Before heading into the tank, I wanted to be prepared to clean out any gunk in it. So the first step is to drain the tank. I read Bentley's and as usual it left me in a lurch. it gets close but is not exact, in this case about the various relays to jump to run the FP without cranking the engine. The diagrams and locations are WRONG.
That being the case, I spliced into the return fuel line at the point of the return line entrance to the tank, so that I could route the return fuel into a gas can.
Started up the car and went through the painfully long process of pumping the fuel into a can and pouring it into another car.
I noticed that at the point just before the reserve light came on, the stream of fuel started to have small bubbles as though it was sucking air. I checked and the car was almost perfectly level.
When the reserve light came on, the fuel stream went from flowing (with the bubbles) to a trickle to no flow to a slight flow and so on. I was watching the stream for a clear sign I had a pump problem. Pump seemed to be working fine up to this point.
I assume that the tank is near bone dry and that the sending unit isn't working as it should or there is a air leak in the fuel components in the tank (hose or plastic parts) above the current fuel level so that it is sucking air.
Assuming the tank is dry, when I get into the tank and remove the guts, I should be able to hook up the sending unit and try it out of the tank and see if there is a way to adjust it to make it more accurate.