Ok I know this has been covered a number of times throughout this forum, cause I have used everyones advice to try and pinpoint why my engine light keeps coming on. I thought I finally fixed it today but right after I passed the 35 mile mark in testing the light came on again. This is what I have done already by the advice given by many others throughout this forum.

I have removed all electrical connections looking for corrosion.None really found, minor carbon build up on the inside of the pump itself behind the 3 screws. I cleaned it up and put it back to gether had code cleared....it tripped within 3 miles.

I have popped the rivets on the back side of the pump checking the fome filter side of it, had some carcoal stains on it but didnt see anything really.

replaced syllanoid just below the check valve today, which after clearing the code today and driving 35 miles I thought it was fixed....my mistake.

I took the check valve off, a mechanic told me if you can blow air and feel it through both ends its bad, mine isnt i dont believe because i can only blow through it on one side and NOT the other.

Ive started the car and put my hand on the pump feeling it wind up, the vibration anyway and I think the pump is good, it doesnt make any whining noices at all.

Im going to take the pump apart tomorrow and look at the blades and see if its actually moving as it should.

Ive read people talk about a fuse or a relay...but I cant find either of those and there are no diagrams I can find to point me in the right direction.

So Im at a loss, because Im trying to sell the car and I have to get that pesky check engine light to stop. My friend owns a delership and he cant sell it for me with the light. I wouldnt ask him to anyway.

So if anyone can help me diagnose this problem It would be greatly appreciated. The only thing I can think of is spending $250 on a pump....