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Unread 08-16-2013, 07:47 AM   #1
sarfu
Registered User
1974 CJ5 
 
Join Date: Aug 2011
Location: Point Pleasant, NJ
Posts: 236
Continuing starting problem???

I am continuing to have starting problems with my 304 V8.
I have done the full team rush upgrade last year.
A new rebuilt mc2100 carb
New fuel pump, new fuel filters installed before and after the fuel pump
New hoses, all new vac hoses ( can't find any vac. leaks)
New High Torque starter and new battery.
My problem is that I have to crank it over two , three times before it starts.
That is not always the case sometimes it starts quickly and other times it takes forever, it is mostly hard to start when warm ( I do have a spacer under the carb )
I am getting fuel in the carb when I depress the gas.
I have played with my timing and have had it anywhere between 8 and 12 degrees.
I have tuned the carb and get 20 on the vac gauge.
The jeep runs and idles awesome all day long.
I guess it could be vapor lock but my fuel filters only have an inlet and an outlet no return line on my '74
How do I get this jeep to start quickly???

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Unread 08-16-2013, 11:16 AM   #2
Neuner-9R
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1985 CJ7 
 
Join Date: Nov 2012
Location: San Antonio, Texas
Posts: 309
Sounds like you have everything right. I'm not familiar or experienced with the 304 but my 258 is the same way. Read on some other sites that even included various types of engines, that even when you have it all set up right, you have to click the key to the first stop to power the fuel pump, pump the gas a couple of times and then it will start right up. Hate that that is my solution but it's what I've been doing and works every time.
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Unread 08-16-2013, 04:59 PM   #3
JeepHammer
Running On Empty...
1973 CJ5 
 
Join Date: Aug 2007
Location: South West Indiana
Posts: 10,714
Not all fuel pumps are created equal...
I had the same issue with cold starts, changed the fuel pump and it started right up right away.
Turned out, the valves in the fuel pump were letting the fuel siphon back to the tank, so I had to pump fuel to the carb after it sat a while.

Another instance,
The ignition wasn't getting good voltage when cranking (Starter Relay).
Changed the starter relay and the problem vanished.
Now I check for voltage at the coil/module while cranking when I'm looking for this issue...

I had a 'Split Switch' ignition in here not too long ago with the same complaint.
Cranked forever, but when you snapped the key switch back to the 'Run' position quickly enough, it fired up.
Changed the ignition switch, Positioned it so the key switch rod/spring moved it to the correct 'Run' position and the problem disappeared.

Another case the choke flap was wedging in the air horn on the carb (Wear slotted what should have been round holes) and when you kicked the throttle it would start right up...

Could be a number of things...
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Unread 08-16-2013, 05:09 PM   #4
LSUtiger
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1980 CJ5 
 
Join Date: Nov 2006
Location: Shreveport, La.
Posts: 1,133
Maybe ditch the filter before the pump.
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Unread 08-16-2013, 05:18 PM   #5
lucdog
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1980 CJ5 
 
Join Date: Jul 2006
Location: , Il.
Posts: 8,158
Quote:
Originally Posted by Neuner-9R
Sounds like you have everything right. I'm not familiar or experienced with the 304 but my 258 is the same way. Read on some other sites that even included various types of engines, that even when you have it all set up right, you have to click the key to the first stop to power the fuel pump, pump the gas a couple of times and then it will start right up. Hate that that is my solution but it's what I've been doing and works every time.
Turning the key to the run position won't power up the OP's fuel pump, unless he installed a electric pump. And he said he has a MC 2100 carb.

OP, when you say you need to crank the enging 2/3 times, you didn't say how long your cranking the engine. Also, when starting a engine with a carb. The gas pedal needs to be depressed a little, if its over 15 minutes since the last start. This gives the engine a little shot of fuel when starting.

B
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Unread 08-16-2013, 06:04 PM   #6
sarfu
Registered User
1974 CJ5 
 
Join Date: Aug 2011
Location: Point Pleasant, NJ
Posts: 236
Thanks for responses guys much appreciated.
I have a mechanical fuel pump which I have changed out twice in the last month, thinking that the pump could be the problem.
Also changed the ignition switch, trying to cover the bases.
Today I installed new seat belts which meant that I had to remove the bench seat in the back to get to the bolts, I have a hole in the tub to access the fuel sending unit and found the rubber hose connected to the fuel line going back to the fuel pump was shot and had a nice size hole in it, I changed it out and took it for a ride and made a couple stops and it seems to have resolved the issue.
I will run it some more tomorrow and let you know if the problem is fixed.
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