Hello, I have a 85 nissan that is carbureted(ccc.....computer controlled crap)....Sombody suggested in my fuel pump post that the gas cap might not be venting properly, could this cause fuel pumps to go bad?....I do hear a hiss or pressure release when I unscrew the cap to refuel the car, so either there is pressure in the tank or a vaccum.

Hi. I have a 85 Honda Prelude with duel carbs, and it hisses when
I take the cap off. it's suposed to do that.

What are the symptoms with your car?

Shane.

Hello, the symptoms are that it eats mechanical fuel pumps about every year, it wont always idle, sometimes dies at stop signs, usually after you drive it a while like 10 minutes. the carburator system consists of anti dieseling solenoid(had to rewire the hot and ground to it because the power was dropping out), mixture solenoid, richer solenoid..(I think that is the way it "chokes the engine do to the fact that it doesnt actually have a choke. The idle is controlled by a vaccum modulator that opens the throttle on start up (like a fuel injected engine) and it also holds throttle open upon release of gas pedal(not sure if that is workin corrrectly because it almost always holds throttle open somewhat. I would think after the car has warmed up, it should release throttle totally so it would idle at the normal 800 rpm, it rarely lets the car idle at 800 although when you come off a long haul like the freeway and get onthe offramp it will die

hello, rreally short stop and go it idles a little high and wont die, but drive non stop for any time at all and come to a stop sign and it will die

it's standard shift? yep my honda does this, it only has 78,000
miles on it, so it's not worn out.
I may be wrong, but I don't think the Japanese really shined with their carbs.
I'll take any carb problem over a computer/fuel inj. problem.

I think the fuel pump should last at least 5 years.
but other than that I don't really know how to help you.
you might get a manual for that car, Chilton not Haynes,
Haynes manuals are worthless!

How about some specs? Engine, car model?

Otherwise we are doomed to comparing Hondas to Nissans.

I wasn't implying that the cap would ruin your fuel pump, I was thinking maybe you were building up pressure in the system and flooding the engine, but I don't believe that's the case now. Why did you replace the pumps previously, does it start right back up after it stalls? Sounds like the anti dieseling valve isn't staying up?

hello this is an 85 nissan sentra 1.6L gas with a carburetor. Yes it starts right back up. Was working on it today in the driveway and it was running ok and then just sputtered and died. I had the vacuum idle control unplugged so it would idle where it is supposed to and it idled fine for a while then died

sorry, yes its a standard shift

noob question : have you changed the fuel filter?

I'm pretty sure nissans had trouble with distributors around that year, causing them to quit for no reason, the fix was replacing them, just another thought!