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Originally Posted by Racer23gt
what is the best way to figure out if my fuel pump is bad or good.
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Use the fuel pump interlock bypass at the test connector. That will tell you if the pump works. I think that they are called FP and B+. You jump them together and the fuel pump comes on with the ignition.
With the ignition switch turned to 'ON', and the Fp and B+ connectors jumped you should hear fuel noise from the pressure regulator return hose. It will be quite obvious. If not check for voltage to the pump.
But if that makes things work again, then it is the interlock switch in the AFM or the relay that goes with it, and not the fuel pump.
Another MR2 Owner mentioned this trick
Quote:
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Originally Posted by 85SuperGZE
A quick trick I learned, if you pull the afm leave the connector in and you can physically move the flap in the afm to make the pump activate, if your afm is bad, chances are it's not bad at the wide open position, since there are diffirent levels of function where the flap is positioned.(ie. diffirent specs per bgb to check the afm operations at certain flap positions). I did this when the fuel pump wasnt within spec and had to replace it but the tank was full, so to get the gas out I undid the feed line to the fuel filter put a gas can under it and fluctuated the afm flap to make the pump "think" it needed to supply fuel. You have to have the key in the on position. It only works if the fuel pump has any life left in it, saves you from syphoning the gas out. DOING THIS IS AT YOUR OWN RISK, KEEP HEAT AND FLAME AWAY, EVEN SHOP LIGHTS, KEEP FIRE EXSTINGUISHER NEARBY AS A WATER HOSE WILL ONLY SPREAD A LIQUID GAS FIRE, I IN NO WAY TAKE RESPONSIBILTY IF SOMETHING BLOWS UP OR CATCHES FIRE. A just in case warning for anyone attempting this, not that most of you aren't smart, it's if your too smart and want to blame somebody legally.
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