..the fuel relay 3-second prime should still work right, even though I'm getting low on fuel.?
ive no idea what low means, 1 cup , 1 gallon 3 gallons?
the pump will pump fuel only if
the tank is level, and say 1 gallon or more fuel.
Ive no idea at all how any pump SOCK fits into any tank bottom after all there are like 5 aftermarket tanks sold. and many were replaced long ago.
Id guess 1gallon minimum (I really hate to guess but there you are) if the tank is not level it sure can suck air. with 1gallon.
if the pump sucks air it makes more noise, not less. (after all its now sitting in free air space and not submerged in fuel.)
THE ecu NEVER KNOWS PRESSURE IS WRONG, EVER. it just does the 3 seconds blind as a bat, and dumb as a brick, it is JUST a 3 second counter inside the ECU. (deep) (this statement does not hold true on NEW cars with rail pressure sensors, and more smarts)
here is what happens and why.
the key is turned, from off to on
if the ECU has DC power, the ECU then turns on the pump for 3 seconds
the ECU is the timer, (soft/firmware instructions inside do that only)
this is called the priming pulse. it attempts to charge the fuel lines up to 34 to 41PSI, (41 is very common at sea level, FPR does the regulation now)
The priming pulse ends, and the pump goes silent.
if you crank the starter, the pump runs at 12vdc full time cranking, there is no 3 second rule cranking ever. so that too is a valid test.
but you cant hear any pump cranking, so...
we know the pump is failing
we dont know why yet
after all the wires to it can in fact be bad, and is super common on any old car.
and 10x that in the SALT BELT states.
https://en.wikipedia.org/wiki/Salt_Belt
ive no idea what low means, 1 cup , 1 gallon 3 gallons?
the pump will pump fuel only if
the tank is level, and say 1 gallon or more fuel.
Ive no idea at all how any pump SOCK fits into any tank bottom after all there are like 5 aftermarket tanks sold. and many were replaced long ago.
Id guess 1gallon minimum (I really hate to guess but there you are) if the tank is not level it sure can suck air. with 1gallon.
if the pump sucks air it makes more noise, not less. (after all its now sitting in free air space and not submerged in fuel.)
THE ecu NEVER KNOWS PRESSURE IS WRONG, EVER. it just does the 3 seconds blind as a bat, and dumb as a brick, it is JUST a 3 second counter inside the ECU. (deep) (this statement does not hold true on NEW cars with rail pressure sensors, and more smarts)
here is what happens and why.
the key is turned, from off to on
if the ECU has DC power, the ECU then turns on the pump for 3 seconds
the ECU is the timer, (soft/firmware instructions inside do that only)
this is called the priming pulse. it attempts to charge the fuel lines up to 34 to 41PSI, (41 is very common at sea level, FPR does the regulation now)
The priming pulse ends, and the pump goes silent.
if you crank the starter, the pump runs at 12vdc full time cranking, there is no 3 second rule cranking ever. so that too is a valid test.
but you cant hear any pump cranking, so...
we know the pump is failing
we dont know why yet
after all the wires to it can in fact be bad, and is super common on any old car.
and 10x that in the SALT BELT states.
https://en.wikipedia.org/wiki/Salt_Belt
http://www.fixkick.com