JBAV6Tony
Member
- Joined
- Oct 15, 2016
- Messages
- 93
- Reaction score
- 21
- Points
- 8
- Age
- 68
- Location
- Strathbogie Victoria
- Members Ride
- JBA kit car V6 series 1
Hi all,
Since I've had JBA (for newcomers it runs a V6 3800cc Buick engine EFI) everytime I've unlocked the fuel cap a rush of air enters the tank. This vacuum I'm suspicious has caused me a few issues in summertime.
In summer if having filled the tank and driven say 300km, the car runs well until a long hill or heavy slow traffic comes along. The engine starts to miss, wont rev well and eventually dies. Then its hard to restart.
As the engine has had coil, plugs, leads etc all replaced as well as all sensors, I'm suspicious the tank isnt allowing air to enter via the fuel cap. I've tested the Ford XE cap, i.e. blew air through the keyhole and sucked through it and some air gets through both ways but it might not when hot?
So, I've drill a few small holes in the rubber gasket to help this senario.
I might point out that in a standard Holden Commodore, where the engine came from, the tank normally has a venting pipe from the tank to a carbon canister for anti pollution reasons and is vented to the atmosphere or the engine, I have no such canister.
So my theory is that in hot weather the tank has a vacuum to the point whereby the exterior (12 months old)electric pump can no longer pump fuel to the engine , the engine gets less and less fuel and begins to starve itself.
What are your thoughts? Is it just a case of ensuring the tank has the ability to replace the used fuel with air and all will be good?
Since I've had JBA (for newcomers it runs a V6 3800cc Buick engine EFI) everytime I've unlocked the fuel cap a rush of air enters the tank. This vacuum I'm suspicious has caused me a few issues in summertime.
In summer if having filled the tank and driven say 300km, the car runs well until a long hill or heavy slow traffic comes along. The engine starts to miss, wont rev well and eventually dies. Then its hard to restart.
As the engine has had coil, plugs, leads etc all replaced as well as all sensors, I'm suspicious the tank isnt allowing air to enter via the fuel cap. I've tested the Ford XE cap, i.e. blew air through the keyhole and sucked through it and some air gets through both ways but it might not when hot?
So, I've drill a few small holes in the rubber gasket to help this senario.
I might point out that in a standard Holden Commodore, where the engine came from, the tank normally has a venting pipe from the tank to a carbon canister for anti pollution reasons and is vented to the atmosphere or the engine, I have no such canister.
So my theory is that in hot weather the tank has a vacuum to the point whereby the exterior (12 months old)electric pump can no longer pump fuel to the engine , the engine gets less and less fuel and begins to starve itself.
What are your thoughts? Is it just a case of ensuring the tank has the ability to replace the used fuel with air and all will be good?
