E/J 9.5 pump head

[guy48065]

This '71 9.5 I'm working on has been slowing down & stopping after a couple minutes running in a barrel. Everything checks out on this motor but I haven't got into the carb yet. It runs so well when first started I was hoping I didn't need to rebuild the carb.
Somewhere in the service manual is a fuel pressure test that says to not place the gas tank more than 30" below the inlet when running the pressure test...so...I put the tank on a waste basket and then the motor ran on & on (but with some rpm variation & the occasional cough...I might need to dig into that carb anyways).

My question is this: *should the fuel pump draw fuel from a foot below the skeg*? It seems to me that it should--even though in normal use this would never happen.
The SM really doesn't explain this.

 

[rolmops]

Just for fun, take off the engine cover and see if the problem goes away. If it does go away ,your problem would be a lack of air, possibly caused by exhaust fumes filling up the area under the cowel. It might mean that you have an exhaust leak coming from a leaking exhaust cover

 

[F_R]

My question is this: *should the fuel pump draw fuel from a foot below the skeg*? It seems to me that it should--even though in normal use this would never happen.

Well that would be quite a lift. Maybe it could, maybe not. In other words, iffy.

 

[rolmops]

Quite a lift indeed, but that would mean a lack of fuel, which would cause the engine to rev up before conking out, what he describes is the engine slowing down and dying which points to a lack of air.

 

[racerone]

It should have no problem with fuel tank on the ground.

 

[Crosbyman]

how about cleaning the carb to eliminate that possibility.. nobody runs a tank at skeg level anyway in normal operation.

try hand pumping the fuel and it the engines runs OK check for air leaks and fuel sqwirting or a bad pump/filter. ...

I was hoping I didn't need to rebuild the carb.

a carb refresh, new coils, condensers, points plug wires, boots, plugs
timing..... it is all part of the game to restore oldies.

why skip the carb job and get stuck out on the water because some crud loosened up ?.

 

[guy48065]

Looks like the consensus is..."maybe".

Am I the only one to run one of these in a barrel, with the fuel tank on the ground? I guess so since nobody said "it works for me".

 

[racerone]

Not at all.----I test motors with tank on the ground all the time.-----Works for me !!

 

[Crosbyman]

that is wonderful news but now he needs to run the engine in the boat and fix a more serious problem tbd. we still do not know if hand pumping helps in any way or if the screen filter on the pump was cleaned out etc....

so many options to a happy ending.

 

[racerone]

I worked on these motors and ran them brand new out of the box.-----But I can not see, hear and feel these motors.-----Yet folks appear to want instant diagnosis from 1000 miles away.----Not going to happen.

 

[guy48065]

Not at all.----I test motors with tank on the ground all the time.-----Works for me !!

Good to know--thanks!

 

[guy48065]

I worked on these motors and ran them brand new out of the box...

Then maybe you can answer a minor question I have.
The stop button & wiring were trashed on this and now I can't recall if the wires were originally run above the linkages & shifter lockout, or were routed underneath.
It seems no matter where I place them they're in the way.