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Main fuel pump 200 1980

posted by  scorch on  Tue May 4 16:36 CST 2004
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Your main tank buzzing like that can be a sign of its imminent failure, but more likely it's a sign of either a bad intank pump or a deteriorated hose that connects it to the main pump (it's a couple inches long, attached to the intank pump - if there's a crack in it Bzzzzzzz).

With the engine running open up the gas cap and listen for the healthy whirring of the intank pump. If you hear nothing or a grindy, whiney uneven sound, replace the intank pump. If the intank pump sounds good check the 700-900 FAQ or your Bentley manual for procedures to measure the flow rate and/or pressure coming from the intank pump. Also check your pumps for current draw before you suspect them.

And you might check into your fuel pressure regulator if you have one. That also can cause your main tank to complain.

Before you replace that awfully expensive main pump, you'll want to disqualify these other more commonly failed components as culprits.






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