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#1 |
Active Member
![]() Join Date: May 2016
Location: Madison WI
Posts: 146
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Long crank after parked for a week
I have a 1971 with the original in cab fuel tank and a transplanted 454. If this truck sits for a week or more it takes a long time to start, It has a new fuel pump and filter. Is there a check valve that should stop the fuel from completely draining the line? If I drive it the following day or two it starts right up. Thoughts?
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#2 |
Registered User
![]() Join Date: Aug 2019
Location: Cheraw
Posts: 1,305
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Re: Long crank after parked for a week
After letting sit for a week take the air cleaner off, pump the throttle a couple of times and see if any gas is squirting into the venturis. If not you carb is leaking down.
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#3 |
State of Confusion!
![]() ![]() Join Date: Jul 2002
Location: Gulfport, MS USA
Posts: 46,844
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Re: Long crank after parked for a week
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Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! |
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#4 |
Active Member
![]() Join Date: May 2016
Location: Madison WI
Posts: 146
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Re: Long crank after parked for a week
Forgot to add it is an Edelbrock carb...
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#5 |
Post Whore
![]() Join Date: Feb 2016
Location: Portland Oregon
Posts: 11,086
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Re: Long crank after parked for a week
When you say a long crank how long are we talking about?
Today's alcohol infested fuel will evaporate faster and more completely than the fuel of yesterday. This can empty the float bowl of combustible liquid causing the condition you are experiencing. There is no need for check valves. The fuel enters those carburetors from the top of the float bowl so the fuel cannot drain out. Old rubber hoses on the suction side of the fuel pump can cause it to suck air and not pull fuel properly making for longer cranking to get fuel to the carburetor. The small air leaks will allow the fuel in the line to siphon back into the fuel tank when the truck is shut off. Making even more work for the pump on start up. I agree with BigBird05 as to the first place to start looking. Then I recommend a careful inspection of the fuel lines. If all is good then pulling the sender and inspecting the lines for damage and making sure the sock isn't plugged. Good luck and please keep us updated.
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. ![]() RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377 |
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#6 |
Registered User
Join Date: Jul 2015
Location: Sedalia Mo.
Posts: 1,131
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Re: Long crank after parked for a week
I have 3 "sitters". One has an Edelbrock, one QuadraJet, & One Holley. They will all take 10 seconds (or more) of cranking to fire-up after sitting for a few days. Two of them are manual chokes and tend to fire-up quicker if the choke is pulled where the QuadraJet (with a broken choke) really likes to have some gas poured down it to speed things up.
I have heard of someone on here putting an electric fuel pump in the line (alone with the mechanical pump, I think) to assist with this occurrence, but I have not wrapped my head around how to do it myself.
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He who is without oil shall throw the first rod. Compressions 8.7:1 1972 C10 1976 C10 (parts truck) 1985 K20 |
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#7 |
Active Member
![]() Join Date: May 2016
Location: Madison WI
Posts: 146
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Re: Long crank after parked for a week
Length of cranking time could be up to a minute, the fuel lines are new and not leaking from the fuel pump to carb. I have yet to carefully look at the lines from tank to pump but do not have a raw fuel smell or anything on the floor after parked. Additionally the oil doesn't smell like fuel. I have been suspect of the carb but don't have any proof.
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#8 |
Registered User
Join Date: Dec 2009
Location: El Dorado Ca
Posts: 3,374
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Re: Long crank after parked for a week
I have an edelbrock on mine, i added an inline electric fuel pump underneath the truck,switch under dash, turn on the pump for a few seconds and the truck fires right up, then turn the switch off....
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#9 |
All about them K’s
![]() Join Date: Jun 2014
Location: Land of Entrapment
Posts: 6,370
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Re: Long crank after parked for a week
My 1406 Eddie can take 30 seconds or more of cranking if it’s been sitting more than a few days. I think part of the problem for me is the typical heat soak that boils the fuel in the Eddie’s bowls. If most of the fuel boils out after cutting it off from a long drive then there’s not going to be much fuel remaining in the bowls a week later. I know for a fact mine boils the fuel when it gets good and hot and you cut it off.
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#10 |
Senior Member
![]() Join Date: Dec 1999
Location: Southern California
Posts: 2,799
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Re: Long crank after parked for a week
There is a filter with a check valve. That is the type original to the carb. A lot of the replacement ones I have seen do not have the valve.
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Richard 1972 K10 Custom Deluxe SWB Fleetside My build https://67-72chevytrucks.com/vboard/...d.php?t=800746 |
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#11 |
Registered User
Join Date: Sep 2011
Location: Ark City, Kansas
Posts: 3,332
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Re: Long crank after parked for a week
To start a long sitting car:
Turn the engine over, WITHOUT PUMPING THE THROTTLE PEDAL, even once. Turn it over for about 10-15 seconds. This gets gas TO THE CARB. Then pump the gas pedal one or twice, to set the choke, then spin the engine, see if it hits. If not, spin the engine over, just a little more (to get more gas to the carb) it should start now. Sometimes the engine will hit when you are doing the initial 15 second spin, if so, it’s ready to start. I’ve noticed that (sometimes) if you just jump in a long sitting vehicle, by furiously pumping the throttle pedal and spinning the engine, you can flood the engine, sometimes easily.... |
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#12 |
Registered User
Join Date: Oct 2020
Location: hebron, illinois
Posts: 139
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Re: Long crank after parked for a week
Electric or manual choke ?
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#13 | |
Registered User
Join Date: Nov 2014
Location: Austin
Posts: 749
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Re: Long crank after parked for a week
Quote:
But, my 72 240z behaves like this. If it sits more than a couple of days, it was very hard to start. So, added an electric pump. Datsun was kind enough to wire every car for an electric pump near the fuel tank. I also added a electric fuel pump controller under the dash. The controller shuts of the fuel pump if there is no tachometer signal present. So, my solution was to not connect the controller to the tank. Without the signal, upon turning on the ignition, the controller will run the electric pump for about 2 seconds...this is long enough to prime the carburetors and make for easier starting. Once the engine fires, the mechanical fuel pump takes over (and I don't have to listen to the electric pump running). Could be an option. Bonus: If the mechanical pump dies, all i have to do is connect the tach signal to the pump controller and I am on my way. |
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