Need help with fuel issues...

[SuDZ]

Hi All,

I have been getting back into my 260Z as of late after taking off about two years from it while renovating a house etc etc with the same old excuses. I am back and at it full time and ready to get my Z going again.

I was looking to get it fired up shortly and the last day or two I have reconnected my carbs, changed my oil, change oil filter, replaced plugs, replaced air filter, replaced the first white clear fuel filter after the tank, I am replacing the filter inside the electric pump tonight, and a few other things here and there like replacing coolant lines etc. I also forgot to mention that I have drained the gas and put in some new fresh stuff. The stuff that came out was not all that bad.

I was trying to test for fuel last night at the carbs and I pulled the hose at the fuel inlet and it was bone dry. I am wondering where to test next. I took the hose off and put the ACC in the ON position and pumped the gas for a while. Nothing was happening as far as gas coming out the hoses. I traced back the tubes to the other side of the engine and I found the mechanical fuel pump. i was wondering what to check (if anything) on the mechanical fuel pump. Do I take that apart and check for something? I am just trying to figure out where the gas stops reaching.

SuDZ

[webdawg1]

Might want to check the fuel lines coming from the fuel tank forward. See if they might be GUNKED UP real bad. Maybe blow air thru them to see if they are clogged...

webdawg1

[SuDZ]

Might want to check the fuel lines coming from the fuel tank forward. See if they might be GUNKED UP real bad. Maybe blow air thru them to see if they are clogged...

webdawg1

Do you mean like the tubing between the tank and the hard pipes? Or the ones between the hard pipes and the mechanical pump?

SuDZ

[yungman]

i need help my car i running to rich i have replaced the fuel pump fuel regulator air flow meter and it still gets to much fuel wat other thing should i get to fix the problem?

[280~Master]

SuDz,

You want to blow all of the lines out from the tank to the carbs and make sure they are clear of rust and other things like roaches and Ect.

Yuongman,

There are several things that can cause rich fuel. Maybe you could start a new thread about your problems. You kind of like hijacked this thread. Just because you replced something like the Airflow meter does not mean the one you put into it was good either. You also have the temp sensor that can be your problem. Good luck with it.

[SuDZ]

SuDz,

You want to blow all of the lines out from the tank to the carbs and make sure they are clear of rust and other things like roaches and Ect.

I'll give it a look tonight again. Last night I had blown air from the hoses on the inlet tube on the carbs that connect to the fuel rail. I will take out the electric pump tonight and blow those lines out as well in each direction to see what's what.

Hopefully I can figure something out soon enough and get the Z started.

I will let you know where I get and if I can't figure something out I will post some more questions.

Thanks all.

SuDZ

[beandip]

i need help my car i running to rich i have replaced the fuel pump fuel regulator air flow meter and it still gets to much fuel wat other thing should i get to fix the problem?

You are hi-jacking this thread . Post your question with a new thread

[beandip]

SudZ, before you blow air pressure through the fuel line disconnect it from the front filter. Take care blowing pressure through the electric and or mechanical pumps. the fuel rail has a metering hole on the end of it where it connects to the hose going to the return line. It is a vary small hole and not much air will flow through it. If you have an old speedo cable , this makes a good flexible ''roto-router'' to clean fuel lines if necessary. I have a question or two. In your original post you stated that you were ''pumping the gas'' how were you doing this, also what carbs do you have? Gary

[SuDZ]

SudZ, before you blow air pressure through the fuel line disconnect it from the front filter. Take care blowing pressure through the electric and or mechanical pumps. the fuel rail has a metering hole on the end of it where it connects to the hose going to the return line. It is a vary small hole and not much air will flow through it. If you have an old speedo cable , this makes a good flexible ''roto-router'' to clean fuel lines if necessary. I have a question or two. In your original post you stated that you were ''pumping the gas'' how were you doing this, also what carbs do you have? Gary

I was just trying at first to pump the gas pedal to get gas coming. I thought the mechanical pump would pull some of the gas through this way. This was before I realized the mechanical one would only work after a certain (400 I think) rpm range. Is this the right way to get the gas to start coming through or should I be looking into an alternative way?

Also, I have the flat top carbs. I know most people will tell me just to swap them but right now this is just to get the car running before that. These carbs had been rebuilt before I reinstalled them however.

Thanks for all the help, I have been pouring over the forums non stop since I started work on the car again.

SuDZ

[SuDZ]

I only had a few minutes to work on the car tonight so I disconnected the line from my mech and elec fuel pumps. From there I blew air from the mech pump back through the hoses after disconnecting from the elec one. The air blew right through without a problem which was good. So I guess tomorrow I will finish taking the elec pump apart and replace the filter and put it back together and see what's what.

SuDZ

[beandip]

first of all , pumping on the throttle has Zero effect when the engine is not running. These carbs as well as the Round top SUs have no accelerator pump like is found on American cars or Weber's. When you turn the key the electric pump should activate. The mechanical pump only works when the engine is turning over . It works off the cam in the engine. Before you start pulling things apart. Test to see if the elect pump is getting power . You could have a broken wire or a blown fuse. Check the fuses with a continuity test , don't just rely on looking at the fusible strip inside the glass. The engine will run just fine on just one pump. I am running the electric only and have been for years. I cannot remember if the 260 had a electric pump cutoff that cut power if the engine was not running , a safety measure. If any one has info in this chime in here. Gary

[sleepyzzz]

i replaced my stock electric fuel pump with the 12vt Holley offered by MSA. when we first turned the key on, it wouldn't run. this car had been sitting for the last twenty years. taking a pair of jumper cables, we attached them directly to the pump off of the battery and it ran fine. after a few minutes, the pump ran on its own. my buddy helping me figured that the relays had finally kicked in, getting power to the pump after sitting for so long without working. we have had no problems with the pump since, and even did away with the mechanical pump on the engine. fwiw

butch