the-sleeper-z31 Posted January 29, 2011 Share Posted January 29, 2011 Ok, I just aquired a 1974 260z. unforuntunately, the engine had no compression on cylinders 1 or 2...... long story short, I pulled the carbed L28 out of my 1976 280z 2+2, and droped her in. My question is, can i use the M/f/p off the L26/E88 on my l28/n42? did the cam gear still have the eccentric lobe on the front of it? If this solves anything for me, it will be saving a good valve cover gasket and not destroying it just to look. thanx in advance Quote Link to comment Share on other sites More sharing options...
blue72 Posted January 29, 2011 Share Posted January 29, 2011 Simple answer: If it came with fuel injection, it will not have an eccentric on the cam to run a low pressure manual fuel pump. Quote Link to comment Share on other sites More sharing options...
the-sleeper-z31 Posted January 29, 2011 Author Share Posted January 29, 2011 sweet. is there the same rubber fuel lines off the bottom of the tank in the 260 as the 280? or could i mount the electric fuel pump in the engine bay, (is that even posible?) lol ... it sure would be easier. Quote Link to comment Share on other sites More sharing options...
skib Posted January 29, 2011 Share Posted January 29, 2011 Best to have it close to the tank. It wants to push, not pull Quote Link to comment Share on other sites More sharing options...
Leon Posted January 29, 2011 Share Posted January 29, 2011 Manual fuel pump? That would be a hell of a workout! Quote Link to comment Share on other sites More sharing options...
the-sleeper-z31 Posted January 29, 2011 Author Share Posted January 29, 2011 lol yep hell of a work out! and the pushing and pulling senario sound logical. thanx Quote Link to comment Share on other sites More sharing options...
the-sleeper-z31 Posted January 29, 2011 Author Share Posted January 29, 2011 also any segestions for a carb? im running a 390 holley on a bob sharp racing manifold, six to one equal length header. just seems like there is more power there that im not tapping into... Quote Link to comment Share on other sites More sharing options...
blue72 Posted January 29, 2011 Share Posted January 29, 2011 Manual fuel pump? That would be a hell of a workout! Ever seen cars from the brass era? Plenty of them from that general time frame had a handle that you'd pump to pressurize a tank, which would push fuel up to the carburetor. Quote Link to comment Share on other sites More sharing options...
SHO-Z Posted January 29, 2011 Share Posted January 29, 2011 Now wait a moment. I have a 280 engine in my 260 with carbs and a mechanical fuel pump. If that is the question it will work. For EFI you need a inline electric pump or a 280 fuel tank with internal pump. Quote Link to comment Share on other sites More sharing options...
NewZed Posted January 29, 2011 Share Posted January 29, 2011 From what little I know of the other Z years, the 1974 260s came with both mechanical and electric fuel pumps, in series. Maybe your electric pump is still there. If not, at least the wiring and plumbing should be. Crawl under the car and look around at the front of the gas tank. Quote Link to comment Share on other sites More sharing options...
Tony D Posted January 31, 2011 Share Posted January 31, 2011 (edited) Simple answer: If it came with fuel injection, it will not have an eccentric on the cam to run a low pressure manual fuel pump. This is incorrect, early N42's do have the eccentric! Even though they were 'EFI' motors, there were plenty of other applications (especially in the JDM) where they could go either EFI or Carb and would need the eccentric. The only way to know is pull the valve cover and check. This does not 'destroy' the valve cover gasket. I have had my cover off with the stock Nissan Gasket now countless times without ever changing it, no leaks yet. Don't let that stop you. Chances are good that if the head does not have an open fuel pump boss on the front of the head, it won't have the eccentric. But if you got a head with a 'block off plate' on there, it may or may not have the eccentric. Edited January 31, 2011 by Tony D Quote Link to comment Share on other sites More sharing options...
Tony D Posted January 31, 2011 Share Posted January 31, 2011 also any segestions for a carb? im running a 390 holley on a bob sharp racing manifold, six to one equal length header. just seems like there is more power there that im not tapping into... noisy Holley Red or Blue out back with regulation at the float bowl will work just fine. Quote Link to comment Share on other sites More sharing options...
the-sleeper-z31 Posted February 1, 2011 Author Share Posted February 1, 2011 Yep,... this particular 260 has both an inline pump at the back, and then the MFP on the head. I doo have a block off plate. And I tried to install the MFP on my L28/N42. it dosent seem like it wants to go all the way in there.??? like a 1/2 inch away. anyways, checked the electric pump and got it working. f/p relay is bad so had to run a jumper wire. It pumps, but nothing comes out! also there is some sort of vent hose on the drivers side, on the very rear of the tank, that just spews gas out of it. this beautiful car sat since 1993 in north west washington. needless to say I have some work to do. was wondering if the damper like object next to the fuel pump, and in line with it, would be stoping the pump from being anything more than a helper pump? my 280 uses the same pump... no thingy...... ??? Quote Link to comment Share on other sites More sharing options...
skib Posted February 1, 2011 Share Posted February 1, 2011 Manual fuel pump? That would be a hell of a workout! misread that lol missed the "mechanical" part Quote Link to comment Share on other sites More sharing options...
Tony D Posted February 2, 2011 Share Posted February 2, 2011 the 260 had a bendix licensed pump that put out 3-4psi, the 280z used a bosch lic ensed pump that puts out 30+ psi, they are not 'the same'---if your 260 has a bosch pump out back, it's not from the factory. by 'damper thingie' do you mean the rear-mount fuel filter that came in the 260's? what about the internal fuel filter on the bendix licensed pump? Have you downloaded the FSM for your vehicle yet, it gives specific instructions for installing the mechanical fuel pump, you have to compress the arm and fenagle a bit to get the rubbing block onto the cam eccentric, it may 'hang out'... Quote Link to comment Share on other sites More sharing options...
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