Fuel Issues - Boat loosing power

[JKane]

Hello,

New to this forum and I'm hoping to get some help with my boat. I have a 2005 Glastron with a Volvo Penta 5.7 GI-E

We have been having a loss of power issue. The boat will run perfect for a minute even at full throttle and then all of the sudden we loose power, it feels like someone throttled back. Sometimes it will even backfire. When we feel the loss of power, we go into neutral and we here a whine and it is coming from the smaller pump in the front of the assembly. Eventually the pump stops whining and returns to normal. We can then go right into full throttle no problem and then the same problem will repeat.

We noticed that the electrical connector going to the smaller pump is extremely hot to the touch. Even the wires are hot to the touch. We were thinking that the pump is acting up as soon as it heats up and when it cools off runs fine. We have replaced the filter and all with no luck. If the smaller pump was going bad would it cause this extra load on the wires?

Also, is it possible to change the front small pump alone?

Thanks for any help! Hoping to get this figured out soon.

John

 

[Scott Danforth]

Yes, you can . however most likely the paint is coming loose inside the fuel cell blocking the screens. Google fuel cell issues Volvo penta. Also seach iBoats. Plenty of threads on it

 

[JKane]

Yes, you can . however most likely the paint is coming loose inside the fuel cell blocking the screens. Google fuel cell issues Volvo penta. Also seach iBoats. Plenty of threads on it

Thanks for the reply. I've read up on this, but if the regulator screens were clogged would the boat run so well for the first 30 seconds or so?

 

[Scott Danforth]

It depends. Only way to diagnose the regulator screens is pull the fuel cell apart

 

[JKane]

It depends. Only way to diagnose the regulator screens is pull the fuel cell apart

Ok thanks. Question for you, which pump is the LP and HP pump? Is the smaller one on the outside the LP?

Also, the shrader valve on the bottom of the pump assembly, if I push that in while the boat is running, should gas shoot out or dribble out?

Thank you!

 

[Scott Danforth]

You should never vent fuel into the bilge.

Use a gauge.

Here is a thread on pulling the pump apart. http://forums.iboats.com/forum/engin...uel-cell-5-0gi

 

[JKane]

You should never vent fuel into the bilge.

Use a gauge.

Here is a thread on pulling the pump apart. http://forums.iboats.com/forum/engin...uel-cell-5-0gi

I only ask because when I checked to see if air needed to purge out from the new filter, only a couple drops dribbled out

 

[NoExcuses]

After replacing my fuel pump assembly and cleaning the pressure regulator screens of my 2003 5.0 GXi engine, I also had backfiring. I had pulled all of the injectors and had them cleaned and tested they were very dirty. I had no more back firing after injector servicing.