Falls Flat after 65MPH
Le Mans Master
Joined: Apr 2011
Posts: 6,284
Likes: 1,171
From: Hermosa
Couldn't you just measure the output of the fuel pump to determine if it's starving for fuel from the fuel tank?
If at 65mph which is close enough to 60 mph for simplicty of the math and that's where it starts having problems then it could be computed how much fuel the engine should require at that speed.
If your doing 60 mph that is one mile per minute.
Then if you get 10 mpg that is one gallon of fuel every ten minutes.
So given that info run the engine for one minute at cruising rpm and you pump should produce 1/10 of a gallon or just short of a pint.
If you get 20 mpg then it'll be half that amount (little less than 1/2 pint) and at 15 mpg in between those two etc.
You'll need to pull off the fuel line and run it to a container via a rubber hose or something and have an alternate supply for the carb. Just gravity should be able to supply the engine well enough for the one minute. worth a shot.
This is assuming that the problem is not related to the opening of the secondaries and this is all done running on the primary side of the carb.
If at 65mph which is close enough to 60 mph for simplicty of the math and that's where it starts having problems then it could be computed how much fuel the engine should require at that speed.
If your doing 60 mph that is one mile per minute.
Then if you get 10 mpg that is one gallon of fuel every ten minutes.
So given that info run the engine for one minute at cruising rpm and you pump should produce 1/10 of a gallon or just short of a pint.
If you get 20 mpg then it'll be half that amount (little less than 1/2 pint) and at 15 mpg in between those two etc.
You'll need to pull off the fuel line and run it to a container via a rubber hose or something and have an alternate supply for the carb. Just gravity should be able to supply the engine well enough for the one minute. worth a shot.
This is assuming that the problem is not related to the opening of the secondaries and this is all done running on the primary side of the carb.
Last edited by REELAV8R; Sep 12, 2012 at 10:40 PM.
Thread Starter
Heel & Toe
Joined: Feb 2012
Posts: 22
Likes: 0
From: Niagara Falls New York
Thank you everyone to replying to this thread. Its all fixed!! Drove her to work (30mi) this morning then drove her hard all the way home and no problems. It was definately the sock. Ordering a new one but I do have an in line filter before and after the pump. Now I can get back to planning the motor for over the winter. Either an LQ4 or stroke my 350.
