irishfield said:No pumps required in a gravity feed system. If you have a mechanical pump on your engine..then yes you need a back up "boost" pump.
redrooster said:irishfield said:No pumps required in a gravity feed system. If you have a mechanical pump on your engine..then yes you need a back up "boost" pump.
Not a hard and fast rule... the (first year) 1948 (ragwing) Cessna 170 has an engine driven fuel pump, the only 170 model to have one. No electric backup pump. The engine-driven pump is there in case a line unports and the fuel level in the tank is too low to re-establish siphon-action and start gravity feeding again. The pump will suck the fuel up to the high point in the system (top of the forward door post), then gravity takes over.
Rooster
KelvinG said:Signature...
"Only a virtuous people are capable of freedom. As nations become corrupt and vicious, they have more need of masters." Benjamin FranklinIf Ben were here today, he might rephrase that to:
"Only a virtuous nation is capable of freedom. As masters become corrupt and vicious, people have more need of freedom."
Dan2+2 said:So,If the system passes the nose up fuel flow test then no pump is needed for the low pressure carb? That is how my J4 and J5 are setup but I wasn't sure if an O320 would the work same as a c85.
Dan2+2 said:Thanks irishfield thats just the info I needed.