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HI, I just found this forum and am I glad.
I recenlty bought a great stock 76 280z 2+2 and discovered the fuel line from the tank to the fuel pump was crimped because someone had just used a thin piece of hose which was also two long. It had been running great. I would start it once a week and let it run for about 20min. waiting til I could replace the line. Well 2 weeks ago I did that and after about 5 min it died. I thought it had run out of gas, I went ahead and replaced the fuel line and realized the problem wasn't low fuel. Well here's what it does - it starts immediatly and runs strong for about 15-20 sec. then it dies. I can repeat this for about 10 times and again it doesn't run rough at all however if I press the accelerator then it immediatly kills the engine. I've replaced the inline fuel regulator no change I don't have a way to measure in-line fuel pressure. I suspect maybe the fuel pump but don't know. Any ideas? How strong of a stream should the fuel pump produce if disconnected and just pumped into a bucket? I tried this and it didn't seem to be very strong. If this is the problem are there any after market models that can be used like Mallory? Thanks for your help

Jerry
 

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Sounds to me like it might be the pump I just cleaned my gas tank out and I just took the hose and let it pump the gas out and it would spit it out pretty fast so maybe thats it
I have a 280ZXT so maybe it needs more gas so Im just guessing if alot if not coming out at once then maybe thats your problem I hope

about a new pump I think you can use other brands but Im not sure hopfully some one else will post a message for you

Jeff 81 280ZXT
 

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> HI, I just found this forum and am I glad.
> I recenlty bought a great stock 76 280z 2+2
> and discovered the fuel line from the tank
> to the fuel pump was crimped because someone
> had just used a thin piece of hose which was
> also two long. It had been running great. I
> would start it once a week and let it run
> for about 20min. waiting til I could replace
> the line. Well 2 weeks ago I did that and
> after about 5 min it died. I thought it had
> run out of gas, I went ahead and replaced
> the fuel line and realized the problem
> wasn't low fuel. Well here's what it does -
> it starts immediatly and runs strong for
> about 15-20 sec. then it dies. I can repeat
> this for about 10 times and again it doesn't
> run rough at all however if I press the
> accelerator then it immediatly kills the
> engine. I've replaced the inline fuel
> regulator no change I don't have a way to
> measure in-line fuel pressure. I suspect
> maybe the fuel pump but don't know. Any
> ideas? How strong of a stream should the
> fuel pump produce if disconnected and just
> pumped into a bucket? I tried this and it
> didn't seem to be very strong. If this is
> the problem are there any after market
> models that can be used like Mallory? Thanks
> for your help

> Jerry

Hi Jerry

I live in Australia and we did'nt receive the 280Z here but i will try and answer your question I am Guessing that this motor is fuel injected? if so the fuel pump should be pumping 36 to 40 PSI at quite a considerable volume!!! so it is aparent that your problem is related to the pump. Was the replaced hose the supply to the pump or the return from the fuel rail?I assume it was te supply , if so it is possable that when you changed it it allowed a grater volume of fuel to flow out of the tank and sucked up some crud whiched has blocked the small nylon filterwhich slips inside the inlet pipe on the pump you will need to remove the pump to see this as it is hard to see on the car. where are you chacking the fuel flow? at the pump or at the fuel filter under the hood?
As you can emagine it is hard to diagnose your problem from here as there are so many questions I need to ask
I have good knowlage of the fuel system on these cars as well as several manuals from BOSCH if you need more help email me and I will try.

SeeYa Colin
 

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when you turn on the ignition, can you hear the fuel pump whinning? If so, you fuel pump is probably ok.
Check all connections to the afm, cold start valve, air reg., thermotime, ect.
Also make sure that the rubber hose going to the fuel filter is not switched with the return fuel hose.
 

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Speaking of fule filters... did you change yours. Not a bad idea if you haven't already.

Make sure your air flow meter is operating correctly. If its potentiometer hits a dead spot that will certainly kill the engine. Also try increasing the engine rpm very slowly. iIf you notice a range where the engine has difficulty running you can suspect the air flow meter.

> HI, I just found this forum and am I glad.
> I recenlty bought a great stock 76 280z 2+2
> and discovered the fuel line from the tank
> to the fuel pump was crimped because someone
> had just used a thin piece of hose which was
> also two long. It had been running great. I
> would start it once a week and let it run
> for about 20min. waiting til I could replace
> the line. Well 2 weeks ago I did that and
> after about 5 min it died. I thought it had
> run out of gas, I went ahead and replaced
> the fuel line and realized the problem
> wasn't low fuel. Well here's what it does -
> it starts immediatly and runs strong for
> about 15-20 sec. then it dies. I can repeat
> this for about 10 times and again it doesn't
> run rough at all however if I press the
> accelerator then it immediatly kills the
> engine. I've replaced the inline fuel
> regulator no change I don't have a way to
> measure in-line fuel pressure. I suspect
> maybe the fuel pump but don't know. Any
> ideas? How strong of a stream should the
> fuel pump produce if disconnected and just
> pumped into a bucket? I tried this and it
> didn't seem to be very strong. If this is
> the problem are there any after market
> models that can be used like Mallory? Thanks
> for your help

> Jerry
 

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Jerry:

If your fuel tank is dirty, i.e., rust, sediment, etc. it may be a semi-plugged fuel line. If you fuel pump is whining real loud, it may be the dirty tank. If you do end up purchasing a new pump, get three bids from the local parts store. I purchased a fuel pump from Action Auto for $89 with a limited lifetime warranty. This was a much better deal than I could have gotten with Victoria British or Motorsport. The fact that your fuel pump is whining and not releasing fluids (hose fitting clamped correctly), your fuel pump should be ok. Good luck....

HI, I just found this forum and am I glad.
> I recenlty bought a great stock 76 280z 2+2
> and discovered the fuel line from the tank
> to the fuel pump was crimped because someone
> had just used a thin piece of hose which was
> also two long. It had been running great. I
> would start it once a week and let it run
> for about 20min. waiting til I could replace
> the line. Well 2 weeks ago I did that and
> after about 5 min it died. I thought it had
> run out of gas, I went ahead and replaced
> the fuel line and realized the problem
> wasn't low fuel. Well here's what it does -
> it starts immediatly and runs strong for
> about 15-20 sec. then it dies. I can repeat
> this for about 10 times and again it doesn't
> run rough at all however if I press the
> accelerator then it immediatly kills the
> engine. I've replaced the inline fuel
> regulator no change I don't have a way to
> measure in-line fuel pressure. I suspect
> maybe the fuel pump but don't know. Any
> ideas? How strong of a stream should the
> fuel pump produce if disconnected and just
> pumped into a bucket? I tried this and it
> didn't seem to be very strong. If this is
> the problem are there any after market
> models that can be used like Mallory? Thanks
> for your help

> Jerry
 
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