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86 B2 Cranks But wont start
Posted: Sun Jun 01, 2008 2:33 pm
by LilnaYt207
OK so i know there a ton of posts about this subject, i have personally read six about this, so i guess starting my own is kind of pointless, but each situation is different. So i got the truck not running, the guy told me the in tank fuel pump was what was bad, i replaced that, no fire, i then replaced the in line pump, again, no fire, i replaced the spark plugs, hoping to God it was something more, since a just spent about $150 on the pumps, and no fire, so at the same time still wishing it would have started, i then found out about the inertia switch, so i reset that, again with the no fire, it will start when i spray starter fluid in the intake, i then replaced part of the fuel line it was kinked, so now i'm trying to figure out what to do next, i'm going to replace the fuel filter but i don't think that would completely stop it from running? it would at least run, just really crappy right? I haven't done anything with the injectors, but this is a budget project, so i'm trying to start with the cheap stuff, if it is them i'll fix it but don't want to if i don't need to, i guess my question is what next, could my fuel lines be plugged and if so whats the best method to find where? the fuel does get to the second pump but there is not alot of pressure, so any info, ideas, or help would be greatly appreciated, thanks b/c i want/need to wheel, soon
Re: 86 B2 Cranks But wont start
Posted: Sun Jun 01, 2008 5:05 pm
by vabronconut
take off the hose from the accumulator and make sure the tank pump is putting fuel to there. then disconnect the engine side of the high press pump again checking thats its putting out fuel there. if fuel looks good at both places go to the fuel rail on the engine and look for a bycicle valve and press it with the ignition on. it should shoot allot of fuel out, if it spits air keep holding it until it shoots fuel. then try starting it. if you have fuel at the rail the fuel system is ok. you will need to check the ignition sys. quickes way is to use a phillups screw driver and put the end in the end of the plug wire to any spark plug and hold the middle of the screw driver about a 1/16" off of the block or metal engine bracket and try to turn it over. you should see a arc between the screw driver and the block. if not you know your not geting fire. beware make sure you only hold the plastic handle of the screw driver do not touch the metal!!!
Re: 86 B2 Cranks But wont start
Posted: Sun Jun 01, 2008 8:28 pm
by LilnaYt207
Thanks i'll try that and let you guys know if she fires, hopefully it will, i need to take it out and abuse it a little.

Re: 86 B2 Cranks But wont start
Posted: Mon Jun 02, 2008 11:25 am
by DBrown
if you fire when you spray starter fluid in the intake it is a fuel problem.
I always listened for the frame rail pump to kick on then you first turn the key on. if you don't hear it you are not getting power to the pump. also one thing I didn't see you checking was the fuel pump relay. I think they are around $15. if you are not getting power to the pumps check there first. I would just use a jumper wire and see what happens.
Re: 86 B2 Cranks But wont start
Posted: Mon Jun 02, 2008 10:52 pm
by LilnaYt207
So i replaced the filter today, and it was full of all kinds of S**t, so i got my hopes up and thought it would start, it didn't. So the relay your talking about, is that the cylinder shaped piece that is between the in tank and in line pump? The fuel lines run through it and i was told it is some type of regulator? Or are you talking about the inertia switch, or something completely different? If you could describe the location that would be great, if it's something electrical, i'll probably need a novel from you guys, i'm about retarted when it comes to that stuff! Mechanical i can figure it out electrical confuses me, not sure why? thanks again for everything.

Re: 86 B2 Cranks But wont start
Posted: Tue Jun 03, 2008 5:20 am
by DBrown
first when you turn the key on did you hear the pump kick on?
Re: 86 B2 Cranks But wont start
Posted: Tue Jun 03, 2008 1:36 pm
by vabronconut
at first you said you some flow but it was very poor. then you changed the fuel filter and it was full of crap. if you hear the electric pump come on like dbrown said, i would pull the gas tank pump/sending unit. the pump has a inlet screen that could be clogged or worse varnished. if the pump sender is covered in a hard brown crust then the tank is varnished and will need to be cleaned. let us know if you hear the electric pump come on its under the drivers door on the inner frame rail. the can your talking about between the tank and pump is the fuel accumulator.
Re: 86 B2 Cranks But wont start
Posted: Fri Jun 06, 2008 8:13 pm
by LilnaYt207
OK so i replaced the fuel pressure regulator today but have not started it yet, the battery is dead, and i didn't feel like standing in the rain any more, i love Washington!!! so if the rain lets up i'm gonna try to start it, if it doesn't i will tomorrow, i'll let you guys know what happens.
Re: 86 B2 Cranks But wont start
Posted: Fri Jun 06, 2008 9:05 pm
by LilnaYt207
Well the rain stopped, the heavens cleared, the jumper cables were connected, everything was ready to have my truck start. Guess what? it didn't! so i have now replaced everything from the in tank all of the way to the fuel rail, so this leaves me to believe it is something electrical, you would not believe how close it was to starting! its effing toying with me, seriously, i don't know what to do next, all input is apreciated, i'm about to take the little machine out get my rifle and try out the new tracers i got on it, so like i said please help, i just want to go wheel.

Re: 86 B2 Cranks But wont start
Posted: Sat Jun 07, 2008 8:48 am
by vabronconut
first tip--stop buying and replacing parts. test them first. go to the rear tank and check power at the wire to the pump in the tank for 12v. im thinking its probably yellow. key must be turned on. if the high pressure fuel pump on the rail is working but the low pressure pump in the tank is not then the high pressure cannot suck fuel past the tank pump. if you have 12v at the tank pump hook it back up and disconnect the fuel line at the accumulator and see if the pump is actually working. if your not getting 12v at the rear pump then check the fuel pump relay. using a schematic you can use a meter and check if the relay is working without buying one. also check the connector side of the relay harness. it is a open connectore which gets allot of dirt and water which leads to corrosion. i would clean it either way and pack it with dielectric grease. stuff like this is a small fix but does take allot of trouble shooting. be patient and check things out and you will save a ton of money.also while your back at the tank make sure your gound is in connected and in good shape. if the tank pump is good repeat the process for the high pressure pump on the rail. REMEMBER***** THE PUMPS ONLY STAY ON FOR A FEW SECONDS when the key is turned to the on position. they then will cut out thinking they have built pressure in the fuel line. so you will need help checking for power.