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Discussion Starter #1
I have a stock 87 sammy and if it sits for a day or longer without being started it needs a considerable amount of cranking to get going. Once it starts up, I can shut it off and it will fire up immediately the rest of the day. What could cause this, and what's the fix? Any ideas are welcome.
 

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carb or injected? what motor?
 

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Discussion Starter #3 (Edited)
Hi 2013GV. My stock 1987 sammy has a carb and 1.3L.
It's like the gas drains out of the line and back into the tank and starting it after it sits overnight is like it ran out of gas and the fuel pump needs to suck the gas all the way up from the tank.
 

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If this is the hard starting cause of course.........

if its losing fuel from the line, this is caused by the non return valve in the fuel pump failing allowing fuel to drain back to the tank. Quite possible as this could account for the first hard start of the day and easy starting from there on

BUT....

There should be fuel in the carb float bowl so the truck should start and run for a bit anyway first thing in the morning.
If its not starting immediately (which it should if the float bowl is full) you have another issue. Prove the pump issue by disconnecting the line between the pump and the carb and crank, fuel should be there immediately. If its there, then you have another issue and you need to check for spark etc.

Does it start immediately if you squirt starting fluid down the carb at first start?
 

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If this is the hard starting cause of course.........

if its losing fuel from the line, this is caused by the non return valve in the fuel pump failing allowing fuel to drain back to the tank. Quite possible as this could account for the first hard start of the day and easy starting from there on

BUT....

There should be fuel in the carb float bowl so the truck should start and run for a bit anyway first thing in the morning.
If its not starting immediately (which it should if the float bowl is full) you have another issue. Prove the pump issue by disconnecting the line between the pump and the carb and crank, fuel should be there immediately. If its there, then you have another issue and you need to check for spark etc.

Does it start immediately if you squirt starting fluid down the carb at first start?
In your experience, if it does or does not start with starting fluid.....what could some of the causes be?
 

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if it does start with a squirt, its lacking fuel, non retun valve, lack of fuel in float bowl, choke not operating correctly.

If its no different with starting fluid, check for spark and start diagnosis from there, many causes, do the basics, plugs correctly gapped, check valve lash, clean distributor and leads / lances etc. If no spark then thats a whole different area to look at
 

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if it does start with a squirt, its lacking fuel, non retun valve, lack of fuel in float bowl, choke not operating correctly.

If its no different with starting fluid, check for spark and start diagnosis from there, many causes, do the basics, plugs correctly gapped, check valve lash, clean distributor and leads / lances etc. If no spark then thats a whole different area to look at
Thanks for your reply! I Appreciate it.
 
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