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bad fuel pump?

Old Aug 4, 2020 | 07:57 PM
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mcaramb's Avatar
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Default bad fuel pump?

UPDATE: FIXED! See my repost at 'Bad Fuel Pump Disco 2 SE7' under Discovery 2 thread for more details...

UPDATE: After checking for voltage at blue/white and common wires at the pump, it shows 0v when turned to run position, but while cranking it varies between 6-12 volts intermittently which is what is proabably causing the pump to spurt. Somethings not right electrically. Maybe a bad ground came loose? Or maybe is there any other relays I should be checking? So far, I've just swapped out the one under the hood with the windsheild wiper relay and checked the one fuse there and one under the driver's side.

2001 disco 2 SE7.

ok this is weird, she sat up for about a month, then i moved her to the front yard. Now she won't start. No fuel coming out of the EVAC schrader valve. Swapped fuel pump relay, checked both fuel pump fuses all fine. Pressed and held the inertial switch for 5 seconds and released, but haven't tried bypassing it yet.

So I go into the trunk and pop the gas tank cover under the carpet (I had already cut the carpet long ago to make access easier to the fuel pump for a leaky gasket before), and pop off the fuel line from the pump. I Put the key in the fire position, no pump action. but while turning the engine over, the pump starts going, but in spurts, not a constant flow. Is this normal? In my other cars, the pump runs when you have the key in the run position initially for a few seconds before turning over, in this situation, nothing happens until you crank it. But Regardless, I'm still not even seeing the spurts it's putting out at the schraeder valve by the firewall. Is there something between the gas line at the tank and the EVAC shraeder check valve I'm testing at? No check engine light comes on while cranking (just the regular service engine soon, but that's always on cause the faulty knock sensor). I Pulled codes, and it just shows the one for the knock sensor and one for cylinder 3 misfire which is new.

*DISCLAIMER: I’m not advocating at all testing your pump at the tank! Super dangerous, especially if you make a spark. Use the fuel pressure test port at the engine if you can find it. I suspected a plugged line however so I tested at the pump but to do so I cut the line and extended it with some hose, but again do so at your own risk.

Oh, also, I'm pretty sure this car doesn't have secondary air.

thanks for any advice before I spend some duckies on a new pump or go about replacing the CPS

-Mike
 

Last edited by mcaramb; Aug 6, 2020 at 10:59 PM.
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