V-P 4.3 Fuel Pump Problem

alan ber

Petty Officer 2nd Class
Joined
Jun 29, 2008
Messages
143
I am here in Fla, Use my boat weekly ,
Both engines are TWIN Volvo Penta 4.3 GXI
Electric fuel pumps purchased new 2 1/2 years old out of warranty.
.
Around 3 weeks ago , port engine would not start, ( cold ) cranking away ( starboard started fine )
THINKING no fuel getting too rails, ? since no fuel smell , checked fuel pump fuses ( good )
Shot either in throttle opening, fired up . Balance of day once started , started easily and no issue
Next day I tried starting engine , (cold), Same issue, cranking away not starting .
Tired something different, rather then shooting engine start I primed electric fuel pump. Turning key too start but not cranking many times hearing fuel pumps for those few seconds before it cuts off .
Tried firing engine, each time engine wanted too fire , then after the 5th time fired up and once fuel and fuel pump was doing what it was supposed too do it started each time there after .

Both engines feed off of one fuel tank , separate fuel lines going too each fuel pump
.
I will say fuel pump cells are not quiet . Port engine wines at times
Not eager too buy new fuel pumps
Engine was due for oil change & ;fuel filter change
Emptied fuel filters into a clean aluminum can and clearly fuel in filters were clean no dirt at all
After doing service same happened hard starting until I gave it help

MY THOUGHTS
Fuel dropping back from rails or pump not strong enough too pump fuel from cold start . After its going were ok .
If that is the case what cell should I consider
HIGH or Low side .
Never changing fuel cell pumps what can I expect ?

thanks in advance
 

alldodge

Moderator
Staff member
Joined
Mar 8, 2009
Messages
40,750
I would start by putting a fuel pressure gauge on the rail to see what the pressure is
 

Scott Danforth

Grumpy Vintage Moderator still playing with boats
Staff member
Joined
Jul 23, 2011
Messages
47,542
in addition to above, check the anti-siphon valve and the FP reg.
 
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