An responsive throttle

[Charliecn]

I have a 2016 C30 with a VP D435, EVC. Everything is working great until last two times as I'm leaving for the weekend I noticed throttle working fine from 600 to 1850. When upto to temp 185F i start pushing throttle and 1 time it gets to 2250 and stops accelerating. Engine sounds fine no codes. Bring it back 1850 to 2000 all good. Try again i make it to 2430 stops accelerating throttle position physicaly got to WOT position. Seems like throttle failing engine fine. Last weekend noticed I woul push throttle intending to get to 2400 when it didn't respond right away but then jumoed to 2800 after 4 to 5 sec delay. Any one experience something like this?

 

[scross]

I have a 2016 C30 with a VP D435, EVC. Everything is working great until last two times as I'm leaving for the weekend I noticed throttle working fine from 600 to 1850. When upto to temp 185F i start pushing throttle and 1 time it gets to 2250 and stops accelerating. Engine sounds fine no codes. Bring it back 1850 to 2000 all good. Try again i make it to 2430 stops accelerating throttle position physicaly got to WOT position. Seems like throttle failing engine fine. Last weekend noticed I woul push throttle intending to get to 2400 when it didn't respond right away but then jumoed to 2800 after 4 to 5 sec delay. Any one experience something like this?

Similar symptoms to our C-28 a few months back. Air leaking into fuel line at high demand. Ran fine under 2,000 RPM or so but above that started sucking in air. We had a bad primary fuel filter.

Also replaced fuel line hoses from tank to both filters. If the hoses are soft they can collapse under high demand, starving the engine of the fuel volume it needs.

Others with similar symptoms had cracking rubber bleeder pump on top of fuel filter attached to engine.

Check your bleed pump. If it keeps getting air that bleeds out when pumping the black rubber pump using the bleed valve could be an air leak. Then check the fuel hoses and rubber bleed pump top.

 

[Full_O_Fish]

Also you will see similar symptoms if you haven't removed the screen on the fuel tank pickup and its become clogged. Basically fuel restriction whether it's blockage or air ingress will have similar results.

 

[S. Todd]

Similar symptoms when we had a clogged primary fuel filter with a D4 320. The Volvo screen showed a code but without the code book we didn't know what it meant.

 

[Charliecn]

Thanks everyone for help. I was definitely thinking in another direction. Didn't know about screen in pick up. I'll check it all out and see what we find.

 

[AGLyme]

How does one check the screen in the fuel pickup ? Assuming it’s at the bottom of the fuel tank.
Thank you !

 

[Charliecn]

I'm about to find out. Will attempt to remove tomorrow. Will take some pics.

 

[Full_O_Fish]

To check the screen on the pickup tube:

Access the shut-off valves on the top of the fuel tank, shut the valves off then remove the handles. You can then loosen the hose clamp on the fuel line just enough to let the hose rotate on the valve without leaking, and unscrew there whole valve from the 90 degree "block" which is the top of the pickup tube assembly. Once the valve/hose has been removed you can then carefully unscrew the pickup assembly from the tank, be very careful and have a wrench to hold the nut that is molded into the tank because of that rotates/spins then there's going to be not very fun repairs needed.

I found substantial blockages on both my engine and generator pickup tubes including pieces of cellophane type plastic. Thankfully the generator had been asymptomatic due to the relatively low fuel flow rate, but I have been very glad to have removed both screens (generator pickup is higher in the tank so it's less likely to get crudded up, but still much much easier to change an accessible Racor filter than try to disassemble the fuel pickups)

 

[AGLyme]

Thank you Charlie and FoF... sorry to scab onto your string Charlie... I have always wondered how things are on the bottom of my 12 year old boat's fuel tank.