HELP - Fuel Gauge issues

SouthArk370Z

Having any work done at a dealer is going to be expensive. Steep markup on parts and a mechanic's time ain't cheap.

IIRC, the sending unit can be checked with a VOM (see other threads and FSM for details). If it checks out bad, it looks like a fairly easy DIY (at least one DIY thread on this site plus the FSM). If a search for "fuel pump" doesn't work, try "fuel starvation".

I doubt if Techron, et al, will clear up the problem at this point but it's worth a try.

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TheWeez

My fuel gauge had been staying around full even after 120 miles but I am switching out the fuel pump when I install the BP kit. Anything else I need to replace if the sensor is bad?

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EVOHUNTER

I think youll need to buy the sending unit part. The pump Sasha provides is only a pump. Im assuming Nissan only sells the whole unit, at probably 1000$.

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TheWeez

Looks like I have a single turbo Z for sale


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Justice97

Just had the 1/2 tank symptom when i know there is less in tank.
Is the sending unit a dealer only item, I cannot find it anywhere?
Since I don't believe this is part of drive train I don't think they will replace it under warranty for me.

Wilson2608

Hello all, I have had gas gauge issues as well. My car got stuck at half a tank, but would work fine above half. Anyways, the plastic housing that holds the pump, sending unit resistor, fuel temp sensor etc. was broken in half. wtf. Nissan is charging me 500$ for a new plastic housing because it comes with a pump, temp sensor, and sending unit. Found a good deal going for roughly 350$ (if im remebering correctly) at Courtesy Nissan. This comes with a pump, temp sen, and fuel sending unit as well. As for me, I will wait for a more quality product to arise. Phunk will be making this product and he hopes to have it done by monday. Seriously guys, if you replace it through nissan it will break again. Get a nicer housing with a billet top and your good to go.

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Wilson2608

If it is stuck at full it could be a bad ground as well.

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TheWeez

It worked itself out. Thank you though. Now I get 15mpg lol


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Wilson2608

what ended up being the problem? lol why are you getting 15 mpg?

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TheWeez

No idea but it's accurate now
Being tuned safe for boosted applications and 750cc injectors


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Hotrodz

The mpg does not work because you have changed your injectors. Mine reads 3 and 4 mpg most of the time.

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TheWeez

When I put in 18 gallons and it is empty after 270 miles...


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Wilson2608

Yeah I thought the mpg didn't change as long as you drove it lightly, but I don't know that for certain. I mean it makes sense, with X amount of air you'll have X amount of fuel. So if your just driving nicely and not under boost I was under the impression mpg would not change.

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Hotrodz

I think Bullitt said that his guage read like 100 plus mpg and 12k miles till empty. Once you mess with the AFRS and the injectors the ecu is all kinds of confused. I just calculate mpg the old fashion way and because my gas gauge is unreliable I don't drive more than 250 miles before filling up. City only driving is no more than 150 because my right foot has a problem.

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TheWeez

I'm in boost everyday I drive


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