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Need Some Help Please


ddezso

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Hi there.  I used to be active in this forum ages ago but three kids in a row took me out of the Z Car scene for a long time.

I've got a 1971 (build late 1970) 240Z that a few years ago I had running in top order.   The last time I drove the car was over a year ago, and after that time (started right away and ran great) I failed to start it for 9-10 months.

 

A few months ago I went out to start it and it just wont fire up.  I am not at all a mechanic and know very little about cars sadly.  I just love Z cars since I got my first when I turned 16.

 

Anyway - the car has a fresh new battery, it cranks and cranks.  I just changed the fuel filter and the lines were dry to and from the filter so it's clear I have a fuel problem.  I'm assuming I have spark but obviously that doesn't matter without fuel.

 

Here's my first question:  I've just changed the fuel filter and there was no gas on either line in or out.  After the change I cranked and cranked it assuming I'd get fuel to the filter but it's still dry.  How do I troubleshoot from here?  I am assuming a fuel pump issue or gummed up fuel in the tank.  What would you guys do next? 

 

Incidentally, I am trying to get it running so I can sell it.  I am in Scottsdale, AZ. 

Thanks

Derek

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I'm pretty sure a late 70 build date will mean your fuel pump will still be the mechanical kind mounted near the front of the engine and if cranking the engine doesn't bring fuel up from the tank then the diaphragm in the pump could be ripped. You could also have a blockage in the tank or fuel line.

If you do have an electric fuel pump in the rear you will have to get under the car and test it.

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I would first take the bigger fuel line off the fuel rail in front of the valve cover, straight from the fuel pump and put it in a clear bottle.  Then turn it over to see if it's pumping.  If it's not you could bypass the fuel tank which most likely is crudded up by taking a 2.5 gallon gas can with some gas and sit it between the radiator and the front grill.  Take the fuel line feeding the pump and put it into the gas can, bypassing the cruddy fuel tank.  Then put the smaller return line from the fuel rail into the can also.  If it pumps then that'll narrow it down to the tank being stopped up.

 

If your getting fuel to the hard fuel lines along the valve cover it could be stopped up carburetor filters or stuck floats or a ton of other stuff.  

We'd love to figure out what's wrong with your car. ;)  

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Or even easier but not a good mouthwash, take the bigger hose off from the fuel filter and give it a good sucking to see if you get fuel up to there.  If it comes to there then it's pretty much the fuel pump.  It has an arm that works up and down off the front of the cam's nose, like an old push and pull water pump from old western movies.  You can remove the valve cover and see it it's broken.  It's at the front and works off an off center cup looking thing.

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Spray starter fluid into the intake and see if it starts. If so, you have a fuel problem. 

Often cranking isn't enough to get fuel to the carbs with a mechanical pump.   squirt a little fuel or starting fluid in the intake and she will probably fire right up.

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One of my 240k's had been sitting for about 9 years. Seemed no amount of cranking could prime the fuel lines so I poured a small amount of fuel straight down the throat of the single carb ( you probably have at least two carbs). Had to do it a few times but just needed to turn over faster I think. Start You Bastard ( spray) would be better if you have a helping hand.

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Hey that's a good idea!  Our SUs have vents on top of the float chambers you could pour gas in somehow I suppose.

 

Could he shoot starter fluid in the mouths of the carbs?  Maybe raise the piston a little and open the butterflies with the linkage?  You should have a fire extinguisher or a hose pipe ready just in case things get away from you.  ;)

 

Maybe buy a low pressure, low price electric fuel pump?  I think Purolator has a square one for about $20.  I've used them on boat motors.

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Fuel pressure for sure.  

 

There's some video on another thread about Hitachis right now, you should watch it until you get the Ztherapy DVD.

 

post-23570-0-28501400-1420031247_thumb.p

 

Or you could try running it with a fuel can, bypassing a possibly crudded up fuel tank.  Put a 2 gallon gas can in front of the radiator then put the fuel lines in it.  The other end of the one going into the pump and the small return line coming off the rail.

 

Ah hell I just realized it runs it just has to have starting fluid to get there.  My bad, just woke up.

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  • 1 year later...

I finally got this sorted out.  The fuel in my tank was basically varnish so I drained it, then blew compressed air back down the fuel lines to make sure they were clear.  I put in fresh gas and was able to get it started.  It limped along for a bit.  Clearly I'm getting fuel no problem now.

But now there's a new problem.  Once it's running it doesn't take long for fuel to start dripping out the bottom of the air filter.  It seems fuel is coming out of the carbs into the filter. After about 30 seconds I figure there was 1/8 to 1/4 cup of gas on the garage floor.

I have no idea how to troubleshoot this.  Any ideas?

Thanks

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Stuck floats. This causes the carburetors to overfill, and it's coming out the vent pipes and into the air cleaner. They could be stuck from the gas turning to varnish.

If you're not familiar with tearing down SUs, you might want to consider contacting Bruce Palmer at Z Therapy for the Just SUs video.

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1 minute ago, SteveJ said:

Stuck floats. This causes the carburetors to overfill, and it's coming out the vent pipes and into the air cleaner. They could be stuck from the gas turning to varnish.

If you're not familiar with tearing down SUs, you might want to consider contacting Bruce Palmer at Z Therapy for the Just SUs video.

Thanks.  Is there any way to unstick short of tearing them apart?  Z Therapy sent me these carbs (years ago)

Edited by ddezso
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It worked.  Thanks!  I removed the small hoses under the float, drained what was in there (not good), and used the wee red WD40 stick to poke at the floats.  Sure enough one of them was stuck.  After one false start, then letting it sit for a couple of hours it's now running.  I can tell it hasn't for a while so tomorrow I plan to let it get all warmed up.  Anything to know about running one of these that's sat without running for around 2 years?

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