Can't maintain fuel pressure

[Jarvo2]

I'm hoping you've referenced the attached fuel system modification guide, right?  Just one of the many bits of documentation that I've collected over the years.

Fuel-1973 240z 1974 260z fuel system modifications.pdf

[siteunseen]

21 hours ago, gwri8 said:

Can't you just slip one of these in the fuel tank?

 

6 hours ago, jalexquijano said:

why the offense? trying to solve fuel percolation at idle during traffic jams and you come up with this?

No offense intended, it's a joke about Viagras ability to make an older man (or car in your case) preform like a young man (or car).  

If you try this beware that any effects lasting longer than 4 hours you should see your mechanic, FYI.

[SteveJ]

Here are a couple of photos of the heat shield. Maybe I'll take some later without the air cleaner in place.

[Mark Maras]

 Good looking heat shield. Do I see a future garage business in the works? A bolt on answer to the heat soak problem would be a valuable addition to the owners who haven'r solved it yet..

[jalexquijano]

On ‎04‎/‎21‎/‎2017 at 10:57 AM, Jarvo2 said:

I'm hoping you've referenced the attached fuel system modification guide, right?  Just one of the many bits of documentation that I've collected over the years.

Fuel-1973 240z 1974 260z fuel system modifications.pdf

Jarvo,

I had downloaded it a year ago and once read, i decided to look for a stainless Steel heat shield extensión  that covers both floats bowls of the 3 screws carburetors on my 72. Anyway today i swapped the complete exhaust of the car with the MSA PREMIUM EXHAUST which has a 2.5 diameter pipe and xlerator turbo  muffler. Once finished i drove out of the shop and got into a 10 minute traffic with lot of heat fron the road.. idle became lumpy until the car died 2 times. I decided to order a Malpassi glass filter and regulator  (85mm versión) to regulate any excess of fuel:

http://www.ebay.com/itm/Malpassi-Filter-King-Fuel-Pressure-Regulator-and-Gauge-clear-glass-bowl-/110622432307

 

If pressure is too high, this will be the symptom? I still dont want to remove the Steel fuel rail!! WHo else had this problem and solve it? I already wrapped the Steel fuel rail and installed a heat shield extensión. What else????

Edited April 22, 2017 by jalexquijano

[Jarvo2]

I'm still of the opinion that its your hot cam from California Datsun.  Get a stock head that's rebuilt to factory specs.

[Mark Maras]

 Jarvo2, Yeah, that cam has always been kind of lurking in the back ground.  It can't be helping the situation, that's for sure.

 jalex, Do you know anyone else in Panama that has a Z. I'm curious if anyone else there is fighting or has solved the problem? 

 

[siteunseen]

19 minutes ago, Jarvo2 said:

I'm still of the opinion that its your hot cam from California Datsun.  Get a stock head that's rebuilt to factory specs.

California Datsun LLC?  

Edited April 22, 2017 by siteunseen

[Patcon]

Fuel lines!!! Come on, how hard can it be to cobble together a set of test lines????????

[jalexquijano]

4 minutes ago, Patcon said:

Fuel lines!!! Come on, how hard can it be to cobble together a set of test lines????????

rubber hoses??

[Patcon]

Yes! Rubber hoses! This is a process of elimination. Try some rubber hoses and bypass the metal fuel rail. If it helps come up with a more elegant permanent solution later! Solve the problem first, then make it pretty...

[jalexquijano]

trying to find a picture of somebody who has replaced the stock metal fuel rail with rubber hoses to determine the exact lenght, material, and routing.