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Old 08-16-2006
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cooltec is on a distinguished road
Universal 5411 Fuel System

Hello - We have a 1982 Pearson 32 with the Universal/Kubota 5411 diesel. Recently started to lose power or die after operating for hours with no problem. Opening the bleed valve releases air pressure. A few seconds (10-30) of bleeding (mechanical pump - decompression lever - turning over engine) refills filter, and restart - no problem. May run for a few minutes or a few hours. May be related to heeling angle when motor sailing (worse heeling to port vs starboard) or sometimes motoring through boat wakes or steep pitched waves. Fuel circuit goes from tank throught shut off valve to glass Racor to fuel pump to bleeder/spinon filter to injectors with excess back to tank. Have emptied and refueled tank, checked dip tube for blockage, replaced Racor separator and spinon fuel filters, tightened all fittings/hose clamps, but still have intermittant air leakage. Appears to be after the Racor (no air bubbles or gaps visible). Don't know much about the mechanical fuel pump. Appreciate any thoughts. Thanks, Ron
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Old 08-16-2006
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We had a 5411 and the fuel pump slowly died. Installed an electric pump (about $60 from an auto parts store) and never had another fuel problem. A side benefit is that the pump will do the bleeding for you.

Strongly recommend it.

Hugs,

SoK
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Old 08-16-2006
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We had a 5411 and the fuel pump slowly died. Installed an electric pump (about $60 from an auto parts store) and never had another fuel problem. A side benefit is that the pump will do the bleeding for you.

Strongly recommend it.

Hugs,

SoK
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Old 08-17-2006
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Thanks SoK - when your mechanical fuel pump failed, was it over time or all at once. This condition is either intermittant or after several hours of operation, and often depends on boat attitude. Not sure how the mechanical pump works or whether the heeling angle plays a part in accelerating the air leak. Appreciate any thoughts. Ron
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Old 08-17-2006
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SoK or others - one other question, do you remove the existing mechanical fuel pump and replace it with the electric, or leave it in place and mount and plumb the electric pump on a bulkhead? A new mechanical pump is about $175. Ron
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