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Engine not cranking

3.1K views 20 replies 12 participants last post by  Bruce1968  
#1 ·
I am need of diagnostic steps on my 67. It is turning over but not cranking. I recently replaced the fuel lines and filter (yes I have arrow correct way). I also removed the fuel pump but did not replace it. ie put same one back on
What steps do I do to see if pump is working. After trying to crank there is no gas smell in carb so I am assuming there is no gas getting to it.
Thanks.
 
#2 ·
if you removed pump you may not have placed the pump lever back on cam. Just pop off the fuel hose coming off pump and put in a plastic bottle and crank engine a few turns...there should be gas in the bottle. If not you may have "re-installed" the FP wrong...or it "coincidently" went bad when you did remove/install it
 
#3 · (Edited by Moderator)
Explain it a little better,"turning over" means the engine is spinning trying to start.And "cranking" means the exact same thing.So what happens when you turn the key ? Does the engine spin but not start ? Does the engine not spin and not start ? does it not spin at all ?
Engines need gas,compression, spark and exhaust to run.If its not spinning fast enough no compression,if its spinning fast but no gas then no start.
If it has gas but no spark then no start either.
Try pouring a little gas in the carb and see if it starts before you replace parts by guessing.It could be the choke is not opening enough or twenty other things of why it won't start.
If it starts after pouring some gas in then it should keep running if not then its a fuel delivery problem.
 
#4 ·
X2 on pouring a little gas in the carb. If your pump has failed or the rod is not up against the cam, it will start with gas in the carb, then die.
Brett.....
 
#12 ·
Set a gas can on driveway, install a length of hose from gas can to pump inlet over the fender, start engine again, and witness if engine keeps running.
If engine runs, bad fuel line in Camaro, or plugged sending unit.
If no run, then bad fuel pump. Fuel pump, if good, will suck fuel from can and fill carb.
 
#13 ·
I was going to suggest this but I would run the hose under the fender\front bumper to a can sitting on the ground so it does'nt have to suck fuel all the way over the fender.

As far us using the bolt to hold the fuel pump push rod, how tight did you go with that? Someone had really cranked it down on the engine that came in my 68 to the point it bent the pushrod. I think that result, on contributed, to an issue I had with the car not wanting to run or start when it was hot. I think it would expand and get stuck. Once it cooled down, it would start and run. That bolt only needs to be snug. If you over do it, I can see an issue with a bent pushrod that will not move.
 
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#15 ·
If your are getting spark, which you must be, if it cranked by pouring fuel in the carb, but does not continue to run, on its own, its a fuel delivery issue and or choke issue. If you still have the divorced choke, look at it first thing while the block is cold, make sure it is closed and not in an open position. do the same thing, pour a "little" fuel in the carb and have someone crank the vehicle while a 2nd person holds the choke closed (be cautious of a back fire flame through the carb) if it continues to run with the choke closed, there may be your issue. (the other way is to invest $12 for a cheep clear plastic 3/8" fuel filter and have someone crank the vehicle so see if you have fuel flowing through the filter. if you replaced the rubber fuel line, did you insure they are 3/8" ? That is the required diameter for proper fuel delivery if you are still using the Rochester or Holly carbs.
 
#16 · (Edited by Moderator)
Dis-connect the fuel line at the carb then put the open end in a metal container or heavy plastic pan like an oil drain pan.Then,making sure the container can't spill have someone crank the engine over for 20-30 secs.You should get almost a quart of gas just doing a volume test this way.Be careful of spillage the can or pan will be on top of the engine and spilling it there can cause problems.
If you do this you won't be assuming that the carb isn't getting any gas,you'll know for sure.No guesswork involved.
 
#17 ·
If I know I have spark I start at the same place. If it's a quadrajet I first check the filter at the inlet of the carb. If a holley I usually have an inline filter so I turn the engine over to see if fuel is flowing past it and then so on working my way back until I find it. Last time this happened on Ole Blue it was the inline fuel filter between the pump and carb. Yet when it happened on the firebird it was the fuel pump. Good luck