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Discussion Starter · #1 ·
Help!!! I've been fighting this problem for eight years! My 280Z runs fine when the fuel tank is full. However, when the guage indicates half, the engine begins to cut out. The fuel pump, (which has been replaced), makes a moaning sound. I've had the fuel tank flushed with acetone twice, so I know its clean. At times the car has quit running all together. When it does quit, I let it set for around 2minutes, and it starts up again , but will only go a few miles until it quits.

help Frank Dixon
 

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Next time the engine quits, crawl underneath
and pull the intake hose off the fuel pump. I bet
you won't get any gas coming out of the fuel tank.
I also have this prob with my '76...Ended up reversing the in/out hoses on the tank, and adding
an external filter to catch all the crap that came out of the tank.....
> Help!!! I've been fighting this problem for
> eight years! My 280Z runs fine when the fuel
> tank is full. However, when the guage
> indicates half, the engine begins to cut
> out. The fuel pump, (which has been
> replaced), makes a moaning sound. I've had
> the fuel tank flushed with acetone twice, so
> I know its clean. At times the car has quit
> running all together. When it does quit, I
> let it set for around 2minutes, and it
> starts up again , but will only go a few
> miles until it quits.

> help Frank Dixon
 

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Discussion Starter · #3 ·
> Help!!! I've been fighting this problem for
> eight years! My 280Z runs fine when the fuel
> tank is full. However, when the guage
> indicates half, the engine begins to cut
> out. The fuel pump, (which has been
> replaced), makes a moaning sound. I've had
> the fuel tank flushed with acetone twice, so
> I know its clean. At times the car has quit
> running all together. When it does quit, I
> let it set for around 2minutes, and it
> starts up again , but will only go a few
> miles until it quits.

> help Frank Dixon
Mr. Dixon, you said you had the tank flushed twice, but did they verify that the brass filter tip on the end of the fuel pickup is still attached? If it isn't the rubber hose will float freely; this tip is weighted to sit on the bottom of the tank. Also is the pick up line replace? if it is cracked or loose, it could concievably pull air into the line, (this is what your problem sounds like...hmmm. I did have a similar problem on a turbocharged 76 z-car (aftermarket) it had a racing fuel pump(75psi), and it would pull a toilet bowl effect in the tank, ie never run below 1/4 tank. Also, is your fuel gauge accurate? you never know....75 takes 15.6 gallons.
 

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Discussion Starter · #4 ·
> Mr. Dixon, you said you had the tank flushed
> twice, but did they verify that the brass
> filter tip on the end of the fuel pickup is
> still attached? If it isn't the rubber hose
> will float freely; this tip is weighted to
> sit on the bottom of the tank. Also is the
> pick up line replace? if it is cracked or
> loose, it could concievably pull air into
> the line, (this is what your problem sounds
> like...hmmm. I did have a similar problem on
> a turbocharged 76 z-car (aftermarket) it had
> a racing fuel pump(75psi), and it would pull
> a toilet bowl effect in the
> tank, ie never run below 1/4 tank. Also, is
> your fuel gauge accurate? you never
> know....75 takes 15.6 gallons.

Mine had a very similiar problem. I removed the tank and soaked it is Kerosene for a couple of days. Then patched the holes. Fixed the problem great. Ran fuel injector treatment and water remover through the tank for the first couple of tanks with 89 oct. gas. No more rust in the tank and when you pull the intake hose out crystal clear gas pours out.

Sam 75 280z
 
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