Tony 260Z
Club Member
Hi all,
I discovered tonight that the Nikki fuel pump on my 240 (L28 with 240Z Hitachis) is leaking oil. It's probably only a teaspoonful but that's enough to produce a dirty mist on that side of the engine and spots on my windscreen where it's blowing out through my bonnet vents. I can't tell whether the leak is at the wider part of the pump where the diaphragm is or where it's bolted to the engine itself. That bit looks as if it might have been siliconed before so I'm wondering if it's the problem spot.
So... three choices... (1) take the pump off, clean up the outside and reinstall it with a better gasket to see if that cures it, (2) as number 1 but try for some sort of rebuild/repair as well, or (3) bin it and fit an electric pump and pressure regulator. I have a Facet red top and a Malpassi Filter King in the garage somewhere which helps.
I'm tempted by option 1 as a fingers-crossed option but have also noticed that when I accelerate hard in first gear, and again in second, when I go into third I get to about 4,000 revs and the engine starts missing. If I then change into fourth it's fine. Feels like fuel starvation to me. Could it be that the pump is failing and the hard charge drains the float bowls? Then the change into fourth and lower revs lets it catch up? Or could it just be that the carbs need setting up properly?
Does all that make the electric pump option the best bet? To be honest I've done most jobs on my Z's over the last fifteen odd years but I'm not a fan of working on the fuel system and I'm not as mentally sharp as I once was so I'm a bit cautious of fuel plus electrics.
All advice very welcome!
I discovered tonight that the Nikki fuel pump on my 240 (L28 with 240Z Hitachis) is leaking oil. It's probably only a teaspoonful but that's enough to produce a dirty mist on that side of the engine and spots on my windscreen where it's blowing out through my bonnet vents. I can't tell whether the leak is at the wider part of the pump where the diaphragm is or where it's bolted to the engine itself. That bit looks as if it might have been siliconed before so I'm wondering if it's the problem spot.
So... three choices... (1) take the pump off, clean up the outside and reinstall it with a better gasket to see if that cures it, (2) as number 1 but try for some sort of rebuild/repair as well, or (3) bin it and fit an electric pump and pressure regulator. I have a Facet red top and a Malpassi Filter King in the garage somewhere which helps.
I'm tempted by option 1 as a fingers-crossed option but have also noticed that when I accelerate hard in first gear, and again in second, when I go into third I get to about 4,000 revs and the engine starts missing. If I then change into fourth it's fine. Feels like fuel starvation to me. Could it be that the pump is failing and the hard charge drains the float bowls? Then the change into fourth and lower revs lets it catch up? Or could it just be that the carbs need setting up properly?
Does all that make the electric pump option the best bet? To be honest I've done most jobs on my Z's over the last fifteen odd years but I'm not a fan of working on the fuel system and I'm not as mentally sharp as I once was so I'm a bit cautious of fuel plus electrics.
All advice very welcome!