75280zguy Posted December 23, 2008 Share Posted December 23, 2008 i just recently bought a 75 280z from a friend it hasnt been daily driven for almost fifteen years.Okay the first couple of days i drove it ran surprisingly well for sitting for so long,but then it started to stall out and hesistate really bad when it got to normal operating temp it gets so bad i can barely drive it its almost like its running to lean.Its got a brand new fuel pump but the old filter i pulled out had really bad blockage changing it helped but it still does it im new to z's and dont know where to start any input would be appreciated ....sorry for the first post it was kinda vauge Quote Link to comment Share on other sites More sharing options...
2eighTZ4me Posted December 23, 2008 Share Posted December 23, 2008 If the car sat for 15 years, chances are the tank is full of rust and garbage, and you've basically clogged the filter of the new fuel pump again from sucking more of that trash up in there. I'd pull the pump and clean the filter screen again. If it's nasty, pull the tank and take it to a radiator shop and have them clean it out and seal it. You "can" do this yourself with the POR15 product, but I highly doubt you'd want to do it in the Colorado winter... plus it's a nasty mess. Money well spent to have someone else do it. Some things you're better off DIY - but things like this, I've found it's better to pay a professional to do. See what the pump filter looks like first though - my guess is it's clogged again. Quote Link to comment Share on other sites More sharing options...
75280zguy Posted December 27, 2008 Author Share Posted December 27, 2008 i asked a couple of my car buddies and they said it almost sounds like a timing issuse as well as fuel. I was just out working on it when i noticed the nipple off the charcoal canister was broke and the line was just dangling its the one for my distributer. Since its vacum advance wouldnt that mean it not advancing like it should Quote Link to comment Share on other sites More sharing options...
FlatBlack Posted December 27, 2008 Share Posted December 27, 2008 When I first got my 280 I went through 5 fuel filters before I broke down and spent the money on a dipped tank. That problem kept coming up for me... I bought a fuel rail with a pressure gauge on it and if you can get one it helps so much while troubleshooting on the fuel side. Quote Link to comment Share on other sites More sharing options...
zbratt23 Posted December 27, 2008 Share Posted December 27, 2008 Dude, start with the tank, just had that issue with a ZX I inherited. Timing issues don't usually just happen all of a sudden, unless that line just fell off while you were driving. The whole car should probably be gently massaged before you expect too much from her. Check the resistance on all your plug wires, replace the plugs, etc... Quote Link to comment Share on other sites More sharing options...
nelson rodriguez Posted December 27, 2008 Share Posted December 27, 2008 i have a77 280. i got it not running thought it was the fuel pump, the filter, the air sensor, and all kind of other stuff. it would start then when it got to temp just shut off. and some times it wouldn't start. turned out to be the pick-up coil. changed that and have had no problems since. except for a bad volt regulator. Quote Link to comment Share on other sites More sharing options...
nelson rodriguez Posted December 27, 2008 Share Posted December 27, 2008 im not sure if a 75 has a pick-up coil thou. but yeah check that. it sounds like the same symptoms as mine had. everything is still stock on it to and i am in love with it. Quote Link to comment Share on other sites More sharing options...
75280zguy Posted December 27, 2008 Author Share Posted December 27, 2008 im on filter number 4 now it dies when it gets to temp i let the car sit for a minute then it fires right back up.I guess tomorow im droppin the tank thanks for the input guys never worked on a z or a car that has sat for so long Quote Link to comment Share on other sites More sharing options...
Clifton Posted December 27, 2008 Share Posted December 27, 2008 I doubt you suddenly have a timing issue. I would suspect the tank as everyone else is. My 73' sat for years and would run in 3 minute intervals. The tank was full of rusty brown crud. I replaced the tank. You can remove the sender and get a light and mirror and look into the tank. Or when it's running like shiit, measure the return volume of fuel. I don't know what the stock pump flows but it should be at least 15 gallons an hour at 35-40 psi for a 180 hp engine. ( A 255 Walbro is around 40-45 gl/hr) Checking this would rule out a fuel issue. Quote Link to comment Share on other sites More sharing options...
tech9 Posted December 28, 2008 Share Posted December 28, 2008 Plug in an inline FP gauge, and under load does the FP drop to a very low rate? I took my whole engine apart before checking tank (lesson learned). Quote Link to comment Share on other sites More sharing options...
nelson rodriguez Posted December 28, 2008 Share Posted December 28, 2008 after you drop that tank, if it still dont work try the pick-up coil. its cheap only 30 bucks and easy. Quote Link to comment Share on other sites More sharing options...
75280zguy Posted January 2, 2009 Author Share Posted January 2, 2009 i just cleaned out out the tank and sure as ♥♥♥♥ it was full of crap.Does anybody know a good way to get it clean or where i can find a new tank cause im getting tired of just looking at it i want to drive! Quote Link to comment Share on other sites More sharing options...
Evan Purple240zt Posted January 2, 2009 Share Posted January 2, 2009 Often radiator shops will boil them out for you, then you coat the tank. Por 15 makes a product that the BMW vintage bike guys swear by. Evan Quote Link to comment Share on other sites More sharing options...
75280zguy Posted January 2, 2009 Author Share Posted January 2, 2009 where would i get it? Quote Link to comment Share on other sites More sharing options...
Clifton Posted January 2, 2009 Share Posted January 2, 2009 where would i get it? http://www.por15.com/ Getting the tank boiled out should be your first priority if it looked anything like mine did. Quote Link to comment Share on other sites More sharing options...
2eighTZ4me Posted January 2, 2009 Share Posted January 2, 2009 Most radiator shops that boil the tanks have their own coating that they use. I've had it in my DD for over 12 years now without any problems at all. I would just pony up the extra $$ and have the rad. shop do it for you. Probably just as cheap as the POR stuff, and certainly not as messy. That way, you walk away from the radiator shop with a tank that is ready to bolt in and go. You did say you wanted to drive didn't you?..... Quote Link to comment Share on other sites More sharing options...
75280zguy Posted January 3, 2009 Author Share Posted January 3, 2009 well i think i got it i used a very high pressure rinse with the aid of some chemicals the inside is now spotless gonna install in a day or two ill let you guys know the results Quote Link to comment Share on other sites More sharing options...
Daeron Posted January 5, 2009 Share Posted January 5, 2009 It is STILL a very good idea to coat the inside of the tank. It might cost $50 bucks, but you have already done ALOT of work taking it off and have more to do to put it on. Sealing it now ensures that it won't leak, rust, or get crudded up again in the future. Its like replacing a timing belt and leaving the old water pump on there. (obviously on a different motor, but im trying to convey a point ) Quote Link to comment Share on other sites More sharing options...
saxfiend1967 Posted January 5, 2009 Share Posted January 5, 2009 ps if fuel pump sat that long id replace it too,it is likely dry rotted and if its mechanical it will fill the oilpan with fuel Quote Link to comment Share on other sites More sharing options...
tech9 Posted January 5, 2009 Share Posted January 5, 2009 Not mech if its fuel injected. But I cleaned mine by putting bolts/nuts/shot inside it with solvent, and shook the hell out of it. It got a lot of the deposited rust out before you coat. I had other problems and had to open the tank and fix some, and welded shut, but POR is great to coat the inside. Quote Link to comment Share on other sites More sharing options...
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