To answer dogma420's question, the fuel tank in a fi car is very different inside than the one in a carbed car. 77-78 tanks are also larger than 75-76 tanks. But they are both different from the 70-73 tanks. The baffles are there to help the fuel system maintain the higher fuel pressure necessary to run fuel injection.

And to oldroaddog, when you say the small filter by the tank, I hope you don't mean the fuel damper. That's not a filter. I'd put that back in if I were you. It's there to prevent fluctuations in fuel discharge pressure. They rarely ever go bad.

The fuel pump has it's own filter, but I've never seen one in any catalog.

Also, what makes you think that the fuel tank is under pressure. The only part of the fuel system that has real pressure is the part between the fuel pump and the presssure regulator, whichincludes the injector rail. The gas tank has some slight pressure because of the returning fuel.

thx

Where did I say the fuel tank was under pressure? Though, in a way it is. You have removed you gas cap when refueling and heard the pressure escape? But that wasn't really the point of my post. And as far as that little filter in the inlet of the fuel pump, all you have to do is remove it (carefully) and clean it.

  sblake01 said:

The baffles are there to help the fuel system maintain the higher fuel pressure necessary to run fuel injection.

What do the baffles have to do with maintaining fuel pressure in the rest of the fuel system? the section between the fuel pump to the injectors is under high pressure, and the return line is low pressure. IMO, the baffles in the fuel tank keep the fuel from sloshing around, which keeps the level sender at a fairly constant level and not bouncing your gas gauge too fast.

You are correct in that the pressure inside the tank is from the vapor pressure of the fuel in the tank, and maybe just a little from the returning fuel.

thx

The answer to your question is in your statement. And I'm glad you think I'm correct. I'm out.

  TomoHawk said:

The red fuel light is the warning light to get you to fill the tank. Most newer cars haver them. What did you do to hget the warning light to work? It has one leg always +12V and is hooked up to the level sender in the gas tank, which breaks the ground leg for the light when you have some gas in there (how much?)

Getting the light to work was easy. The PO had unpluged the connector in the console. But even with the tank full this indicator stays on but the fuel guage functions fairly well (low readings suspect). That would lead me to suspect a short at the switch.

  sblake01 said:

And to oldroaddog, when you say the small filter by the tank, I hope you don't mean the fuel damper. That's not a filter. I'd put that back in if I were you. It's there to prevent fluctuations in fuel discharge pressure. They rarely ever go bad.

Thanks for the heads up on the fuel damper. You learn something new everyday!

So, if the fuel damper is fine, I replace the fuel filter, I've already installed new injectors/fuel lines and I continue to have this intermittant sputtering - the next thing to look at would be the fuel sender. I also want to check the electrical leads and terminals on the sender for corrosion or frayed wires.

ther are actually two (2) arms to the fuel level sensor ( at least in the 280Z). One for the gas gauge, and the other one is just a switch to ground tro complete the circuit for the light. Maybe somebody can confirm this if you have a different car. Hope this info helps.

thx

I think there's a fuel filter on the end of the electric fuel pump in the back...it's on the actual end of the pump...you twist it off...could be wrong though....

There's a little filter that goes inside the "Intake" side of the electric fuel pump. You have to pull the hose off to get to it tho...Following picture shows what it looks like. Last couple I looked at was clogged approx. 70-80% with tank crap. Carb spray works pretty good to clean it out if you use the little red straw...I'd use safety glasses also as that crap goes everywhere when you spray it...

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