RE: 626 fails to start when hot. dealer perplexed.

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RE: 626 fails to start when hot. dealer perplexed.

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Mazda >> Mazda Vehicles >> Mazda 323,Mazda 626 & Mazda 929 >> RE: 626 fails to start when hot. dealer perplexed.

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RE: 626 fails to start when hot. dealer perplexed. - 8/27/2007 10:12:25 AM

hixx

Posts: 451
Joined: 8/26/2007
Status: offline

There is a check valve in the fuel pump that lets the fuel system retain residual pressure. Typically 15 psi or so. If a pressure regulator sticks on the high pressure side it slams the check valve with a higher than normal pressure. This eventually causes the valve to imbed itself into the seat and now the fuel pump has to overcome this excess residual/seated pressure which causes the pump to draw excessive amperage. If i see a bad fuel pressure regulator i always inform the owner that their fuel pump is probably short for the war. The most common cause of a bad regulator is fuel contamination. Water etc.

(in reply to mscallie)