newdatsunowner720 Posted September 9, 2014 Report Share Posted September 9, 2014 Hey guys I am having an issue with my 84 pickup just stalling on me in the middle of driving it down the road. This is twice in 2 weeks it's done it and left me stranded in the road . The first time it did it I figured well maybe it's a fuel pump issue because the ignition would turn ober and everything but just wouldnt crank at all and when i replaced the fuel pump it started driving great again. Well, yesterday evening i did a coolant flush on my truck and got all the coolant up to the recommends levels as per the FSM and got it done and took her for a spin to see how she would drive and it just cut off on me in the middle of drovong. It did the same thing as before . same problem ...it'll turn over but will not crank. Anybody have an answer for me ? Quote Link to comment
84720FourWheel Posted September 9, 2014 Report Share Posted September 9, 2014 Try fuel filter? i had issues when the anti-dieseling solenoid wire was plugged in wrong. It would start if you really tried, but wouldn't stay running, perhaps that wire is loose or broken, and breaking connection. Wiggle the wires on the back of the carb, see if that helps. 1 Quote Link to comment
newdatsunowner720 Posted September 9, 2014 Author Report Share Posted September 9, 2014 Which wires got a pic ? And I'll change it out as soon as I get off work . I know it's a fuel delivery problem I'm sure Quote Link to comment
84720FourWheel Posted September 9, 2014 Report Share Posted September 9, 2014 I'm almost willing to bet that its the anti-dieseling solenoid wires, since it seems intermittent. Basically the solenoid cuts the fuel to keep the engine from running on after the ignition is shut off. I have some pics for you, just waiting on the upload. Here we go: OR I'm fairly sure that your issue lies with the blue/red stripe wires. IIRC when my brother and I did the vacuum lines, the white wire was left unplugged. We plugged it in and she ran beautifully. 1 Quote Link to comment
supererogator Posted September 9, 2014 Report Share Posted September 9, 2014 When you stop at the parts store, get a filter also. Too cheap to let that be the issue. Sometimes a tank flush is in Order also. These trucks are old and have odd things inside them. 2 Quote Link to comment
datzenmike Posted September 9, 2014 Report Share Posted September 9, 2014 This is the throttle cable This is the idle cut solenoid. Just turn the ignition on off on off and you should hear a faint clicking sound. Next time it quits turn the key to ON and listen for the electric fuel pump. The fuel pump relay are problematic. The pump relay is just under the dash on the pass side kick panel, is black, about the size of a small pack of cigarettes and has 4 -5 wires. Check this out. There is a way to jumper the fuel pump to keep it on. If the problem goes away then the relay is the problem. If not then you have at least eliminated the relay as the cause. http://dlarson.hubpages.com/hub/The-Datsun-and-Nissan-Pickup-Fuel-Pump-Relay-What-the-Haynes-Automotive-Repair-Manual-Wont-Tell-You 1 Quote Link to comment
newdatsunowner720 Posted September 9, 2014 Author Report Share Posted September 9, 2014 Thank you for the pics that definitely helps me thing is it runs great when it's running and all sudden just dies on me on me driving it , at first inline engine power and I give it more gas and it like bogs down and it splitters then just dies . I'll also get the fuel filter as well Quote Link to comment
newdatsunowner720 Posted September 9, 2014 Author Report Share Posted September 9, 2014 Mike I was gonna ask that question as I have seen some others have that problem , thanks for bringing that up I'll have to check that as well. I mean it'll go about 20 miles before it cuts off and then again. Quote Link to comment
datzenmike Posted September 9, 2014 Report Share Posted September 9, 2014 BTW turning over and crank (ing) are the same thing and both imply using the starter. The engine may or may not start. Saying it fails to crank is kind of misleading. Next time it dies look at the glass bull's eye on the front of the carb. Gas should be level or at least in sight. If no gas then could be the fuel pump /pump relay. If there is gas then it's not a fuel delivery problem. 1/ The key in the on position will start the fuel pump relay but it will only stay on for 10-20 seconds and then times out. 2/ The start signal to the starter will turn the fuel pump relay on and hold it on while cranking the engine. If engine does not start and the key returns to ON then then go back to 1/ above. 3/ once started, the pump relay needs alternator output and the oil pressure must be high enough to keep the oil light off in the dash to keep the pump going. Without either, it's assumed there was an accident and the fuel should be shut off to prevent a fire 1 Quote Link to comment
84720FourWheel Posted September 9, 2014 Report Share Posted September 9, 2014 I meant the wires behind the throttle cable, its difficult to circle stuff with a trac pad. Sorry if it was misleading. 1 Quote Link to comment
that-son Posted September 9, 2014 Report Share Posted September 9, 2014 still looking for my fuel pump relay... just recently replaced my fuel filter and i ended up with a puddle of gasoline on the garage floor. first, the fuel line from the tank to the filter disintegrated when i pulled it out. then, the line going from the filter to the pump swelled then sprung a leak. moral of the story... if you're planning on replacing the fuel filter, have some fuel lines precut and make sure you have an assistant, a fire extinguisher, something to catch fuel with and something to plug the lines or keep them elevated. better yet, drain the gas tank if she's almost empty. with the needle on my fuel gauge at empty, i still managed to drain 2.5 gallons of fuel. don't ask me why i didn't replace the filter and lines then. oh, and if you do decide to replace the fuel lines, good luck with the hose clamp that holds the line at the gas tank. 1 Quote Link to comment
datzenmike Posted September 9, 2014 Report Share Posted September 9, 2014 The fuel pump relay is on the passenger side at the top of the kick pad up under the dash. Package tray may be in the way. 1 Quote Link to comment
newdatsunowner720 Posted September 9, 2014 Author Report Share Posted September 9, 2014 Whenever I replaced my fuel pump I bad the same issue with fuel getting everywhere lol Quote Link to comment
newdatsunowner720 Posted September 10, 2014 Author Report Share Posted September 10, 2014 Will I burn the fuel pump motor up if leave it with jumper wire scenario? Quote Link to comment
newdatsunowner720 Posted September 13, 2014 Author Report Share Posted September 13, 2014 Okay guys I checked the anti dieseling solenoid and it was good and I did that jumper wire like it says in the article Mike and boom it drunk whoop whoop! Does this mean its my fuel pump relay I'm guessing ? Is it fixed or should I still be worried about it shutting off again? Quote Link to comment
newdatsunowner720 Posted September 13, 2014 Author Report Share Posted September 13, 2014 It will crank and then shut off after about 3 to 4 seconds ( I still have the jumper wire in could that be an issue?) Quote Link to comment
newdatsunowner720 Posted September 13, 2014 Author Report Share Posted September 13, 2014 BTW turning over and crank (ing) are the same thing and both imply using the starter. The engine may or may not start. Saying it fails to crank is kind of misleading. Next time it dies look at the glass bull's eye on the front of the carb. Gas should be level or at least in sight. If no gas then could be the fuel pump /pump relay. If there is gas then it's not a fuel delivery problem. 1/ The key in the on position will start the fuel pump relay but it will only stay on for 10-20 seconds and then times out. 2/ The start signal to the starter will turn the fuel pump relay on and hold it on while cranking the engine. If engine does not start and the key returns to ON then then go back to 1/ above. 3/ once started, the pump relay needs alternator output and the oil pressure must be high enough to keep the oil light off in the dash to keep the pump going. Without either, it's assumed there was an accident and the fuel should be shut off to prevent a fire Is this why it starts and then turns off? Quote Link to comment
datzenmike Posted September 13, 2014 Report Share Posted September 13, 2014 From... http://http://dlarson.hubpa...l-Wont-Tell-You Test Your Fuel Pump AgainIf you have not already tested your fuel pump by running a jumper wire to it, you can do it now. Build a short jumper wire and connect the Blue terminal to the White/Black terminal. When you turn the ignition over to the Accessory position, you should now hear the Fuel Pump running constantly (not recommended as a permanent fix)! When this jumper is connected the fuel pump will be ON when: a/ The ignition is in the ON position b/ The ignition switch is in the ACCESSORY position. It will be shut off when the key if off. This is one way of eliminating the relay as the cause of the fuel pump shutting off. Run with this jumper in place. If it stops shutting off then it can be assumed that it is the relay. If it still shuts off with the jumper in place then it must be something other than the relay. 1 Quote Link to comment
newdatsunowner720 Posted September 13, 2014 Author Report Share Posted September 13, 2014 From... http://http://dlarson.hubpa...l-Wont-Tell-You Test Your Fuel Pump Again If you have not already tested your fuel pump by running a jumper wire to it, you can do it now. Build a short jumper wire and connect the Blue terminal to the White/Black terminal. When you turn the ignition over to the Accessory position, you should now hear the Fuel Pump running constantly (not recommended as a permanent fix)! When this jumper is connected the fuel pump will be ON when: a/ The ignition is in the ON position b/ The ignition switch is in the ACCESSORY position. It will be shut off when the key if off. This is one way of eliminating the relay as the cause of the fuel pump shutting off. Run with this jumper in place. If it stops shutting off then it can be assumed that it is the relay. If it still shuts off with the jumper in place then it must be something other than the relay. Well i have the jumper wire like the article states and the fuel pump turns on when I have it in the accessory/on position and it'll crank and then like 2 seconds later it'll turn off Quote Link to comment
datzenmike Posted September 13, 2014 Report Share Posted September 13, 2014 Well you don't have to have the pump on to start the engine. There will be more than enough gas in the carb for a dozen starts. Check the carb. Is there gas in it? Does the engine start? 1 Quote Link to comment
newdatsunowner720 Posted September 14, 2014 Author Report Share Posted September 14, 2014 I checked the carb glass and it's empty, I checked the fuel pump and it's on and running but doesn't seem to be pumping any fuel. I took the hoses off of it and there doesn't seem to be any suction. Could the fuel pump be burn up? This would be the second pump that I've went through Quote Link to comment
that-son Posted September 15, 2014 Report Share Posted September 15, 2014 what hoses did you pull off? if i remember correctly, you pull the fuel line from the pump output and fuel should flow at a rate of a pint/minute??? do you have the manual? Quote Link to comment
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