Air lock in the fuel system on fiesta 250 vee

paddington75

Hello there. We're getting a persistent air lock in the fuel system on our fiesta 250 vee 2005. The problem seems to be the fuel filler assembly where the fuel line and vent line join together. Should I replace the fuel filler assembly or re-route the vent line to a new over board position?  Many thanks in advance for your help. Cheers Mike 

petelsea

I wanted to respond and hopefully we get an answer.  I have a 2004 Fiesta Vee and have had two occasions where the fuel spews out the filler.  Last time I had some significant leakage in to the bilge.  Any luck?

Willhound

Do you mean when filling? The vent line is built into the filler cap (usually) so it's not just a case of rerouting. Sometimes the vent gets plugged though with spider webs, dirt and other junk. Clean it out and should be good. Also need to really ease up on the last little bit if filling right up.

[Deleted User]

See this previous thread on the topic.

http://rinkerboats.vanillaforums.com/discussion/comment/94476#Comment_94476

Andy

Barion

It sounds like the persistent air lock in your Fiesta 250 Vee's fuel system is likely due to the design of the fuel filler assembly, where the fuel line and vent line join together. This could be causing improper venting, leading to the air lock. Replacing the fuel filler assembly might solve the issue if there's a defect or poor design in that specific component. However, rerouting the vent line to a new overboard position could also be an effective solution, as it would ensure proper venting and potentially prevent future air locks. Before making a decision, inspect the fuel line assembly for any visible defects or blockages, and consider the complexity and cost of rerouting the vent line versus replacing the assembly.

PickleRick

Think of the fuel vent line like a septic line in your home, it has to be a continuous slope.  It can turn left or right but it must remain sloped.   Any dips can and will cause a backup of pressure.  

Plus the spiders that make nests in the vents.   I stuff little pieces of kitchen sponge in the cut out of all my vents.  When they start to deteriorating I replace them, seems to last 2-3 seasons.  


Once you've verified those to things, then sure, throw a fuel filter assembly at it although that shouldn't be difficult to bench test for flow. 

rasbury

Odd- very old thread..

Formulaben

PickleRick said:

Think of the fuel vent line like a septic line in your home, it has to be a continuous slope.  It can turn left or right but it must remain sloped.   Any dips can and will cause a backup of pressure. 

Interesting.  I know cabin cruisers are a totally different breed, but on my previous boat a loop ABOVE the exterior vent hardware was required to be effective at keeping water from entering the vent line and proceeding into the fuel tank.

PickleRick

That does make sense on boats that don't have much freeboard,