bob wrote:
Adding a tee to the fuel line and using the vent is all well and good but if the car was efi or had a bit of thirst there would be a fair chance of the pump dragging the fuel down the sight glass and allowing the pump to suck air. Just thoughts
Bob
As long as you check it with the engine off then it wouldn't matter if it's tapped at the tank outlet.
Had this issue with guys working on boilers and inexperienced techs. They'd check the water height under pressure and it was low, so they'd adj the probes and then it'd read high. Taught them to look at it with the blow-off open and they never had to adjust the probes again!
One hiccup with this method is that it can be inaccurate based on the position of the ports and the angle of the tank. It's needs repeatable level ground to be accurate. It beats a blank, but you have to take it's readings with a knowledgeable grain of salt.
K "leveled" S
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