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Best test to confirm in-tank fuel pump?? 200 1986

posted by  Bill N. on  Wed May 4 16:35 CST 2005
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last visit: Sat Aug 16 14:09 CST 2014
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I have 2 problems.

Have been trying to confirm the function of the in-tank fuel pump and the Amp draw on the main exterior fuel pump on my 1986 240 non turbo.

I do not hear the 1 second primimg sound that I think should occur when I turn the Key to position II.

I have tested the main pump by jumping fuse 4 and 6 and it works fine but shows no amp draw.

The in tank pump shows a 1.75 AMP draw when the car is running. I found that out by removing the #4 fuse and putting the meter leads across the # 4 fuse position.

My problem is I cannot hear the priming from the in-tank pump but it appears to be drawing the above mentioned 1.75 AMPs while the car is running. The starting is not difficult. Is the fuel pump relay bad since I don't hear the priming form the in-tank pump??

Also, when I try to use the meter to measure the draw on the main exterior fuel pump, I don't get any value. This was done at fuse # 6 for this 1986 240 with the fuse removed and the meter leads place on the 2 fuse holders metal ends. I know the pump works cause I can hear it when I jump fuses 4 and 6. My other question is does this jump at between 4 and 6 power both pumps? I'm wondering if the running sounds from the main pump can cover those from the smaller in tank pump?? Nevertheless, I still can not hear the in tank pump prime at key position II.
Thanks for any tips and suggestions.
Bill N. Hartford WI






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