82sunny Posted February 11, 2011 Report Share Posted February 11, 2011 the fuel pump was leaking bad so i replaced it now after it runs for about ten minutes it will die and it will crank but wont start, but i can go back out there in a couple of hours and it fires right back up, but it will die again. whats wrong? has anybody ever heard of this before? Quote Link to comment
datsunaholic Posted February 11, 2011 Report Share Posted February 11, 2011 See if the coil is hot. 1 Quote Link to comment
82sunny Posted February 11, 2011 Author Report Share Posted February 11, 2011 ok, ive gotta leave but im gonna check it when i get back cause it will probaly fire up by the time i get back home Quote Link to comment
datzenmike Posted February 11, 2011 Report Share Posted February 11, 2011 Carry a spare spark plug with you. Next time it won't start pull a wire off, stick the plug in the end and lay on a grounded surface like the valve cover and crank the motor over... is there spark? Quote Link to comment
hitch Posted February 11, 2011 Report Share Posted February 11, 2011 Had something similar long ago. These cars are old, and the fuel lines get soft. They suck down and shut off fuel flow and after they sit open up a little and then the car will run again for awhile. Just something to look at also. 1 Quote Link to comment
banzai510(hainz) Posted February 11, 2011 Report Share Posted February 11, 2011 This only happen after you swap the fuel pump? put the old leaky one back on and see if changes. then I think a fuel pressure peoplem(Ok Im only guess n but you said thats the only thing was changed) maybe float bowl needle is slightly sticky then it runs out of gas in carb? ck coil as other said if hot add a ballast resisitor in series like .7 ohms or so and see if that helps. 1 Quote Link to comment
flyerdan Posted February 11, 2011 Report Share Posted February 11, 2011 Sounds like the fuel tank isn't venting and the pump can't overcome the vacuum. Next time it dies, loosen the gas cap and see if it's under vacuum. Quote Link to comment
82sunny Posted February 12, 2011 Author Report Share Posted February 12, 2011 ok im back, i didnt mention i replaced the starter cause i didnt think it would be factor, but i went back and fired it up drove it around the block a couple of times and then parked it. first thing- it wants to die when i dont give it gas when in gear, but when its parked it idles rough but doesnt seem to want to die as much - and btw it was doing this before i changed the fuel pump - the coil isnt geting hot -when i parked it and turned it off then tried to crank it back over to see if it would start back up it wasnt wanting to like it has been doing until i pressed the gas peddle all the way down -i havent check the plugs yet but i will after i eat Quote Link to comment
datzenmike Posted February 12, 2011 Report Share Posted February 12, 2011 -when i parked it and turned it off then tried to crank it back over to see if it would start back up it wasnt wanting to like it has been doing until i pressed the gas peddle all the way down -i havent check the plugs yet but i will after i eat Now sounds like the choke isn't coming off or the carb is flooding slightly. When you hold the gas down you engage the choke unloader which opens the choke and or gives it lots of air to overcome a rich start. When idling check the fuel level in the carb. Normal or high??? Is the choke fully open when warmed up??? Quote Link to comment
HRH Posted February 12, 2011 Report Share Posted February 12, 2011 You didn't reverse the fuel lines going to the pump did you? Did you put your finger over the outlet to make sure of the suck/blow sides? Quote Link to comment
82sunny Posted February 12, 2011 Author Report Share Posted February 12, 2011 mike- so just look through the window on the carb, and if not normal, how do i fix my choke from sticking if thats my problem? HRH-wouldnt i hear gargleing in the gas tank if i hook the lines up backwards? Quote Link to comment
82sunny Posted February 12, 2011 Author Report Share Posted February 12, 2011 bump Quote Link to comment
]2eDeYe Posted February 12, 2011 Report Share Posted February 12, 2011 it's an adjust ment thing. If you fuel line in the window is off bubble you'll need to adjust the floats. If your choke is sticking it could be bound linkage or it could be out of adjustment. Have you picked up a manual for this car yet? Quote Link to comment
82sunny Posted February 12, 2011 Author Report Share Posted February 12, 2011 nope but i will when i get paid this week Quote Link to comment
HRH Posted February 13, 2011 Report Share Posted February 13, 2011 mike- so just look through the window on the carb, and if not normal, how do i fix my choke from sticking if thats my problem? HRH-wouldnt i hear gargleing in the gas tank if i hook the lines up backwards? It depends. You should, but I've seen mechanical pumps do weird things before. I'd go more towards the sight bowl or something else. Or possibly a plugged return backing up into the carb. Usually not an issue though. Quote Link to comment
82sunny Posted February 13, 2011 Author Report Share Posted February 13, 2011 Or possibly a plugged return backing up into the carb. Usually not an issue though. what do you mean? Quote Link to comment
HRH Posted February 13, 2011 Report Share Posted February 13, 2011 If you're running a return line to the tank, check and make sure it's not clogged, as pressure would build up and then back feed into the carb. Easy way to tell. Locate the return, disconnect and run into a glass jar or something via a length of tube, then start and see if it continues running. Or just wait until it dies then disconnect line and see if there's a whole lot of pressure behind it. Wear goggles, it'll spray if there is. I doubt it's that, but just something easy to check. Quote Link to comment
82sunny Posted February 13, 2011 Author Report Share Posted February 13, 2011 oh and another thing, last night i drove it around the neighborhood and noticed it boggs and wont get anymore power around 35 miles an hour. and i think i need to change the alternator because i just got the battery charged 2 days ago and when i parked it last night and tried to start it up right after i turned it off it was cranking really slow and my head lights were going off when i turned the key. Quote Link to comment
datzenmike Posted February 13, 2011 Report Share Posted February 13, 2011 The return line already has a restriction in it or the gas would simply go past the carb and back into the tank. It's simply a pin hole to allow some circulation of cooler fuel. oh and another thing, last night i drove it around the neighborhood and noticed it boggs and wont get anymore power around 35 miles an hour. I forget. Is this a stock Hitachi carb? and i think i need to change the alternator because i just got the battery charged 2 days ago and when i parked it last night and tried to start it up right after i turned it off it was cranking really slow and my head lights were going off when i turned the key. Get a cheap ass Chinese made multi meter usually less than $10, you should have one anyway. Check the battery voltage when running: should be about 14 volts. If not, then, it's time to check a few things. You have a one in 4 chance of being correct and it's the alternator. Don't throw money at this, figure out what needs replacing. Could be the regulator, bad battery cable (loose), bad starter. Quote Link to comment
82sunny Posted February 13, 2011 Author Report Share Posted February 13, 2011 i think i already got a multi meter in the garage somewhere but its a stock Hitachi. but if it was a bad starter would it still make my headlights go dim Quote Link to comment
datzenmike Posted February 13, 2011 Report Share Posted February 13, 2011 Well it could if drawing too much current. Acts like a short to ground. Quote Link to comment
82sunny Posted February 14, 2011 Author Report Share Posted February 14, 2011 ok im thinking, when i took off my old fuel pump and compared it to the new one they looked different. what do you think? could it be a problem? old one (left) new one (right) Quote Link to comment
datzenmike Posted February 14, 2011 Report Share Posted February 14, 2011 The left one looks closest to the stock Hitachi the other is a jobber replacement. Quote Link to comment
82sunny Posted February 14, 2011 Author Report Share Posted February 14, 2011 i know the other one is a replacement but i didnt know if was the right one and if they ordered me the wrong one, because there was a little bit of info you have to know to get the right one Quote Link to comment
HRH Posted February 15, 2011 Report Share Posted February 15, 2011 Like I said, make sure you got suck/blow/return in the correct order. Mechanical pumps with three outlets can do weird things. Or the pump could be bad out of the box too. Or wrong armature, or your cam is loose if it is on the camshaft nose. Unless it's on the block where it runs off the camshaft directly as in push rod 4. Quote Link to comment
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