Mercruiser 470 fuel pump

Old 04-08-05, 04:02 PM
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Mercruiser 470 fuel pump

I hope someone here can offer some advice. I have a 77 mercruiser 470 and am having fuel problems. When I crank the engine I don't get any fuel out of the pump, but when I removed the pump and actuated the lever by hand, it seems to work fine. Also the eccentric inside the block seems to be OK, but I hav not actually measured it. Could it just be a worn diaphram or is it something worse? Thanks for any help.
Old 04-09-05, 08:44 AM
Ed Imeduc's Avatar
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. Could it just be a worn diaphram
For the cost of it .Id sure try it first. A 77 thats a lot of pumping it has done.

Old 04-17-05, 01:39 PM
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No fuel at pump

Possiblely scale plugging the tank outlet: to clear blow compressed air back into the tank from the fhe fuel line with the filler cap off.

Expect the pump to throw fuel at least 3 feet if disconnecting the discharge line from the fuel pump.

Always a good idea to carry a spare pump for any older engine.


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