SLEDOG Posted December 6, 2021 Author Share Posted December 6, 2021 How much pressure should I be seeing? Quote Link to comment https://www.bigmacktrucks.com/topic/68870-460-aset-no-start/page/2/#findComment-484218 Share on other sites More sharing options...
Joey Mack Posted December 6, 2021 Share Posted December 6, 2021 operating pressure is between 60-100 psi.. did you crack a line at the head and pump the primer till it leaks of, air will bubble out first.. then lock it back down, 2 lines will be enough to get it to fire... 1 Quote Link to comment https://www.bigmacktrucks.com/topic/68870-460-aset-no-start/page/2/#findComment-484220 Share on other sites More sharing options...
Onyx610 Posted December 6, 2021 Share Posted December 6, 2021 Also out of curiosity is this truck parked outside? Anyone that would want to mess with you? I find it pretty odd that it was running perfectly fine and then left for a week or so and then it fired up, ran bad, and then quit. If that’s all the case then take a look in the fuel tank…. Quote Link to comment https://www.bigmacktrucks.com/topic/68870-460-aset-no-start/page/2/#findComment-484221 Share on other sites More sharing options...
SLEDOG Posted December 6, 2021 Author Share Posted December 6, 2021 Yes I loosened the fitting where it goes into block and pumped until I got fuel.... Quote Link to comment https://www.bigmacktrucks.com/topic/68870-460-aset-no-start/page/2/#findComment-484222 Share on other sites More sharing options...
Onyx610 Posted December 6, 2021 Share Posted December 6, 2021 Disregard my last post then Quote Link to comment https://www.bigmacktrucks.com/topic/68870-460-aset-no-start/page/2/#findComment-484223 Share on other sites More sharing options...
SLEDOG Posted December 6, 2021 Author Share Posted December 6, 2021 I did have that thought of somebody messing with me with the fuel....it looks ok but I’m not totally sure on that.... maybe I should dip the tank I guess. I agree....why would it not run after sitting for a week? Quote Link to comment https://www.bigmacktrucks.com/topic/68870-460-aset-no-start/page/2/#findComment-484224 Share on other sites More sharing options...
Joey Mack Posted December 6, 2021 Share Posted December 6, 2021 could be.... many years ago I chased a problem with hard starting and rough running, and after a few days, I found electrical tape in the fuel line from the tank to the lift pump.. someone ( dissgruntaled Employee We thought) anyway there was a roll of electrical tape in the tank, once the glue dissolved, well....... now you have mile long snake... sad thought's but possible... keep in touch.. jojo Quote Link to comment https://www.bigmacktrucks.com/topic/68870-460-aset-no-start/page/2/#findComment-484225 Share on other sites More sharing options...
Onyx610 Posted December 6, 2021 Share Posted December 6, 2021 1 minute ago, Joey Mack said: could be.... many years ago I chased a problem with hard starting and rough running, and after a few days, I found electrical tape in the fuel line from the tank to the lift pump.. someone ( dissgruntaled Employee We thought) anyway there was a roll of electrical tape in the tank, once the glue dissolved, well....... now you have mile long snake... sad thought's but possible... keep in touch.. jojo Wow that’s such an evil idea but a good one too if destroying someone’s truck was your motive! Quote Link to comment https://www.bigmacktrucks.com/topic/68870-460-aset-no-start/page/2/#findComment-484226 Share on other sites More sharing options...
Onyx610 Posted December 6, 2021 Share Posted December 6, 2021 Quick thought I had, have you tried to get it going on ether? Maybe see if once it gets going it keeps going or falls on its face. That might tell you if it’s electrical or fuel related. Idk just an idea Quote Link to comment https://www.bigmacktrucks.com/topic/68870-460-aset-no-start/page/2/#findComment-484227 Share on other sites More sharing options...
SLEDOG Posted December 6, 2021 Author Share Posted December 6, 2021 I’ll check the fuel today and see.... thanks for all your help so far, I really appreciate it!. Sd. Quote Link to comment https://www.bigmacktrucks.com/topic/68870-460-aset-no-start/page/2/#findComment-484228 Share on other sites More sharing options...
SLEDOG Posted December 6, 2021 Author Share Posted December 6, 2021 I tried the ether... it seemed like it finally wanted to start but never did... Quote Link to comment https://www.bigmacktrucks.com/topic/68870-460-aset-no-start/page/2/#findComment-484229 Share on other sites More sharing options...
Joey Mack Posted December 6, 2021 Share Posted December 6, 2021 It is evil but, luckily all i had to do was remove the fuel hose at the primary filter inlet and tank then pull the tape out of the tank, then fish out the cardboard tube that was the middle of the roll.. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/68870-460-aset-no-start/page/2/#findComment-484230 Share on other sites More sharing options...
fjh Posted December 6, 2021 Share Posted December 6, 2021 (edited) So go to the primary fuel filter at the front of the cab remove the line coming from the tank blow it thru make sure its clear ! Remove the elbow the line was connected to and check for debris ! If its clear !check all the lines heading forward I have see stuff clogging the cooling plate as well from deteriorating lines !The fuel transfer pump could be failing is your oil level higher than Normal??? if so change the pump and do an oil change! just some stuff to look for! Just as an after thought make sure the tank vent is clear to ! The simplest of things can cause so many headaches! Edited December 6, 2021 by fjh 1 Quote Link to comment https://www.bigmacktrucks.com/topic/68870-460-aset-no-start/page/2/#findComment-484231 Share on other sites More sharing options...
SLEDOG Posted December 6, 2021 Author Share Posted December 6, 2021 Oil level is not to high...I will check for plugged line.... thanks Quote Link to comment https://www.bigmacktrucks.com/topic/68870-460-aset-no-start/page/2/#findComment-484235 Share on other sites More sharing options...
SLEDOG Posted December 6, 2021 Author Share Posted December 6, 2021 I think I need to check the check valve...that screws out of block correct with a locknut on it? Quote Link to comment https://www.bigmacktrucks.com/topic/68870-460-aset-no-start/page/2/#findComment-484240 Share on other sites More sharing options...
Onyx610 Posted December 6, 2021 Share Posted December 6, 2021 Quote Link to comment https://www.bigmacktrucks.com/topic/68870-460-aset-no-start/page/2/#findComment-484244 Share on other sites More sharing options...
fjh Posted December 6, 2021 Share Posted December 6, 2021 (edited) What you need to do is check that you are achieving the min 60 psi to get it to even fire! does the primer pump get hard when you pump it? Crack number one fuel line pump the primer till most of the visible air is gone crack the number 1 and six fuel lines at the head one fuel turn and pull on the lines pump the primer till you get fuel slobbering from the lines and snug them! and try to start with someone pumping on the primer! by this point the primer should feel hard If not I would suspect that drain back valve your thinking abought or the fuel pump onyx"s pic there! Edited December 6, 2021 by fjh 1 Quote Link to comment https://www.bigmacktrucks.com/topic/68870-460-aset-no-start/page/2/#findComment-484245 Share on other sites More sharing options...
SLEDOG Posted December 6, 2021 Author Share Posted December 6, 2021 Ok I’m looking for a pressure gauge so I can screw in where the fuel temp sensor goes I think.... Quote Link to comment https://www.bigmacktrucks.com/topic/68870-460-aset-no-start/page/2/#findComment-484246 Share on other sites More sharing options...
SLEDOG Posted December 6, 2021 Author Share Posted December 6, 2021 Fjh the fuel pump does get hard but does not seem to stay pressured very long... I did not try to start while pumping....alone here so I can’t do that right now... Quote Link to comment https://www.bigmacktrucks.com/topic/68870-460-aset-no-start/page/2/#findComment-484247 Share on other sites More sharing options...
SLEDOG Posted December 6, 2021 Author Share Posted December 6, 2021 Fjh Any good tricks to get the lines loose....they seem to be on there pretty good... Quote Link to comment https://www.bigmacktrucks.com/topic/68870-460-aset-no-start/page/2/#findComment-484248 Share on other sites More sharing options...
Vmac3 Posted December 6, 2021 Share Posted December 6, 2021 Double wrench the fitting if you can otherwise you can break the fitting. V 1 Quote Link to comment https://www.bigmacktrucks.com/topic/68870-460-aset-no-start/page/2/#findComment-484249 Share on other sites More sharing options...
fjh Posted December 6, 2021 Share Posted December 6, 2021 Nope good quality 3/4 wrench! back em out one turn give em a tug start pumping till fuel dribles snug em then crank! Should fire on thous two cyls till it gets good fuel pressure if its there! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/68870-460-aset-no-start/page/2/#findComment-484251 Share on other sites More sharing options...
Onyx610 Posted December 6, 2021 Share Posted December 6, 2021 Would another decent test be to pressurize the fuel system at the tank and see if it holds pressure or drops off? Quote Link to comment https://www.bigmacktrucks.com/topic/68870-460-aset-no-start/page/2/#findComment-484253 Share on other sites More sharing options...
SLEDOG Posted December 6, 2021 Author Share Posted December 6, 2021 The weather is getting a little nasty here today so not sure if I will be under hood with all this wind.... You guys are a great help for me and I’ll let you know what I find... 1 Quote Link to comment https://www.bigmacktrucks.com/topic/68870-460-aset-no-start/page/2/#findComment-484254 Share on other sites More sharing options...
fjh Posted December 6, 2021 Share Posted December 6, 2021 3 hours ago, SLEDOG said: Ok I’m looking for a pressure gauge so I can screw in where the fuel temp sensor goes I think.... There is a fuel galley plug just above where the blow by can bolts it can be accessed by removing the lid! 3 inch 1/4 pipe close nipple and an elbow! to screw a gauge into! Quote Link to comment https://www.bigmacktrucks.com/topic/68870-460-aset-no-start/page/2/#findComment-484262 Share on other sites More sharing options...
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