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Old 03-08-2022, 11:45   #1
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1996 Mercruiser 454 with electric fuel pump

Hi There

my family and i was on vacation, and when we got back and wanted to go saling, our Mercruiser 454 mpi with electric fuel pump would not start.

A freind of mine took his voltmeter and tried it out on the pump, it only got aroung 8-9 volt and i tried to unscreew the not on top of the fuel pump, there did not come any fuel out when turning the key ignition on the panel.

does anyone here had the same issue , and any fix would be great , thanks ?
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Old 03-08-2022, 16:33   #2
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Re: 1996 Mercruiser 454 with electric fuel pump

What sort of voltage do you get at the battery?
Did the engine turn over?



And the question arises:
> wanted to go saling (sailing?)
What sort of sailboat has a Mercruiser 454 (330HP??)
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Old 03-08-2022, 17:26   #3
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Re: 1996 Mercruiser 454 with electric fuel pump

Sailing?

Anyway, with the voltage at the pump so low, and if the battery voltage is high, Id suspect a seized fuel pump.
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Old 03-08-2022, 21:50   #4
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Re: 1996 Mercruiser 454 with electric fuel pump

Quote:
Originally Posted by StuM View Post
What sort of voltage do you get at the battery?
Did the engine turn over?



And the question arises:
> wanted to go saling (sailing?)
What sort of sailboat has a Mercruiser 454 (330HP??)
Bought batteries is over 12 v
What do you mean by turn over?
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Old 03-08-2022, 21:52   #5
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Re: 1996 Mercruiser 454 with electric fuel pump

Bought batteries is over 12 v
What do you mean by turn over?
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Old 03-08-2022, 21:58   #6
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Re: 1996 Mercruiser 454 with electric fuel pump

Me to
Not stalling, in Harbour and can’t start after coming back from holiday ��
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Old 03-08-2022, 23:25   #7
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Re: 1996 Mercruiser 454 with electric fuel pump

Quote:
Originally Posted by Cartin View Post
Bought batteries is over 12 v
What do you mean by turn over?
What sort of batteries? How much over 12V? ( They can be down to a 30% state of charge and still be slightly over 12V)


What sort of noise does it make when you try to start? A click? A clunk? A high pitched "whir"? A slow, low pitched "whir-whir-whir"?

Turn over : where the cam shaft rotates and the pistons start moving up and down in the cylinders when you engage the starter motor.
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Old 04-08-2022, 01:00   #8
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Re: 1996 Mercruiser 454 with electric fuel pump

Hi
The pump is not making any noise
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Old 04-08-2022, 02:06   #9
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Re: 1996 Mercruiser 454 with electric fuel pump

Quote:
Originally Posted by Cartin View Post
Hi
The pump is not making any noise
I asked : Did the engine turn over!

Not the pump! The engine!!!
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Old 04-08-2022, 04:12   #10
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Re: 1996 Mercruiser 454 with electric fuel pump

Yes the engine turned if you mean the pistons went up and down
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Old 04-08-2022, 04:14   #11
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Re: 1996 Mercruiser 454 with electric fuel pump

You know when your trying to start an engine than you can hear is working but not running, wir wir wir enough power but no fuel is coming through the pump into the engine and pistons
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Old 04-08-2022, 04:24   #12
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Re: 1996 Mercruiser 454 with electric fuel pump

Unless you are running a blower the mechanical pump is more dependable. The electric pump has eaten its brushes needs a new motor
I had a 454 in my Dead Donzi when I found it. I tossed it and put in new engine mounts for a LS3. Some really good aftermarket pumps with way better motors.
Clean all the contacts with a copper brush then no ox grease them up.
If you have a mechanical choke problem the intake will most definitely crack if you work on the choke. I hate rodchester carbs so tossing a 454 intake is Sport for me.
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Old 04-08-2022, 15:14   #13
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Re: 1996 Mercruiser 454 with electric fuel pump

Quote:
Originally Posted by Rumrace View Post
Unless you are running a blower the mechanical pump is more dependable. The electric pump has eaten its brushes needs a new motor

I had a 454 in my Dead Donzi when I found it. I tossed it and put in new engine mounts for a LS3. Some really good aftermarket pumps with way better motors.

Clean all the contacts with a copper brush then no ox grease them up.

If you have a mechanical choke problem the intake will most definitely crack if you work on the choke. I hate rodchester carbs so tossing a 454 intake is Sport for me.


Mechanical pumps have their own set of problems like failed diaphragms which tend to put fuel where its not desired
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Old 04-08-2022, 20:25   #14
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Re: 1996 Mercruiser 454 with electric fuel pump

The marine GM block fuel pump has no weep hole some had a viewing glass. My big block has the delete cap Mechanical pump won’t fit in the V so mine is electric
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Old 04-08-2022, 20:29   #15
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Re: 1996 Mercruiser 454 with electric fuel pump

Fuel pump is an unlikely culprit. 1996. Distributor is more likely. A fried electric will pump enough fuel to idle. Depends would have a Merc coil and pointless distributor. Could be a rotor something that simple.
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