Volvo 7.4GiHUBCE fuel starvation issue

[DCinVA]

I have a 1995 Albe 265 with the 7.4GiHUBCE engine.

I have been having what I perceive as a fuel starvation issue and am trying to track it down.

I have replaced engine fuel filter, and the racor filter. Both appeared clean with no trash.
I pulled the fuel pickups in the tanks and the screens there are clear.
Fuel lines are not obstructed in any way.

I have read here that the inlet screens on the high and low pressure pumps are prone to
clogging, and I was wondering if this was the case with this model and year engine package.

Thanks in advance

BTW, does anyone have any pictures of the pumps and the cleaning process?

 

[Don S]

Re: Volvo 7.4GiHUBCE fuel starvation issue

You will have to look at them to find out. You DO NOT have the fuel cell described in this thread, so be careful what you read. Make sure it pertains to your type fuel system.

Have you done any pressure checks to confirm pressures? Have you done any air leak tests on the fuel system up to the LP fuel pump? An air leak is just as bad as a plugged up pickup.

http://boatinfo.no/lib/volvo/manuals/hu74_mfi.html#/0

 

[DCinVA]

Re: Volvo 7.4GiHUBCE fuel starvation issue

Thanks Don,

Checking for air leaks is first on my list.

Thanks for the link to the manual, extremely helpful.

I will report back what I find.

 

[DCinVA]

Re: Volvo 7.4GiHUBCE fuel starvation issue

Just to follow up.

My issue was that the boat started and idled fine, but would not throttle
up beyond 2500 RPM. Following the testing procedure from Dons
link, I hooked up an external fuel tank to the inlet on the Racor filter.
The boat ran fine with the external tank, indicating that I had an issue
in the tanks, pickups, or lines. I closed the petcocks on both tanks and pulled
a vacuum on the lines. The vacuum held fine, eliminating a possible suction
leak in the lines. I pulled the pickups out of the tanks, and found the screens
clean, the lines clear and in good condition. I pulled the antisiphon valve off
and discovered that it was stuck partially open. I was able to clean it and get
it working reasonable well, but decided to replace it. While I was in there I
replaced all the fuel lines from the tanks to the Racor filter. The boat is almost
20 years old, and this just seemed like a good idea.

Test drove the boat and the problem is solved.

Thanks go to Don who provided the link to the workshop manual which
contained excellent descriptions of the systems, and testing procedures.

Dave