idea - The 1947 - Present Chevrolet & GMC Truck Message Board Network

pokethesmot · 02-22-2009, 03:47 AM

ok well i found out my truck will start if a put a little bit of fuel into the carb but now im wondering is there a way that i can wire a momentary switch up to the fuel pump to like prime the engine

shadetree · 02-22-2009, 10:53 AM

Why not fix the problem? It sounds like the accelerator pump on your carb (asuming it isn't fuel injected) is bad. A vacuum leak could be part of this issue, as could ignition timing/plugs/wires/cap & rotor, ect.

Restrorob · 02-22-2009, 11:15 AM

Unless you've added a electric fuel pump which should be activated soon as the key is turned on, It will be hard to hook a momentary switch to a mechanical pump.

Sounds like the two welch plugs in the bottom of the float bowl, They start leaking fuel out of the bowl into the intake when the engine sits for long periods (over night). Then the engine must be cranked over enough to re-fill the fuel bowl before it will start. These leaking welch plugs can also cause bad fuel mileage.

The fix is remove the carb and cover these two welch plugs with JB-Weld letting cure then re-install.

pokethesmot · 02-22-2009, 12:45 PM

Quote:

Originally Posted by Restrorob

Unless you've added a electric fuel pump which should be activated soon as the key is turned on, It will be hard to hook a momentary switch to a mechanical pump.

Sounds like the two welch plugs in the bottom of the float bowl, They start leaking fuel out of the bowl into the intake when the engine sits for long periods (over night). Then the engine must be cranked over enough to re-fill the fuel bowl before it will start. These leaking welch plugs can also cause bad fuel mileage.

The fix is remove the carb and cover these two welch plugs with JB-Weld letting cure then re-install.

well here is my problem no fuel enters my engine when i crank it only when its running can you see fuel go into it by the fuel filter and for fuel milage i get about 11 mpg

Restrorob · 02-22-2009, 01:03 PM

Well,

With the rest of the story now revealed, Replace the accelerator pump as shadetree suggest.

pokethesmot · 02-22-2009, 01:34 PM

now the accelerator pump is just the fuel pump right?

54Caddy · 02-22-2009, 01:43 PM

The accelerator pump is the pump in your carburetor. What kind of carb are you running?

pokethesmot · 02-22-2009, 01:53 PM

q jet

54Caddy · 02-22-2009, 02:06 PM

Go down to a parts store and get you a rebuild kit for your carb. Or simply just get the accelerator pump. Or if you have the money it is worth getting an edelbrock carburetor they are great carbs.

powerdriver 1958 · 02-22-2009, 02:38 PM

...

Restrorob · 02-22-2009, 02:50 PM

Also, Take all the numbers off your carb with you to get the proper kit/pump.

pokethesmot · 02-22-2009, 02:40 PM

when i pump the gas all the lincage and stuff to the accelerator pump moves but like still i see no fuel goin into the carb

**N2TRUX** · 02-22-2009, 02:49 PM

Once again, it "sounds" like the accelarator pump in the carb. If you don't think you are capable of replacing the pump, see if you can't find someone local that can help.

We don't mind giving advice, but you should be willing to accept it if you ask....

pokethesmot · 02-22-2009, 03:04 PM

Quote:

Originally Posted by N2TRUX

Once again, it "sounds" like the accelarator pump in the carb. If you don't think you are capable of replacing the pump, see if you can't find someone local that can help.

We don't mind giving advice, but you should be willing to accept it if you ask....

i wasnt not accepting it its just powerdriver asked in that pic think if the linkage was good

powerdriver 1958 · 02-22-2009, 03:09 PM

If you try to rebuild yourself here's a link http://www.4wheelnoffroad.com/qjet.html

gafiredog · 02-22-2009, 05:12 PM

Quote:

Originally Posted by pokethesmot

ok well i found out my truck will start if a put a little bit of fuel into the carb but now im wondering is there a way that i can wire a momentary switch up to the fuel pump to like prime the engine

mine was doing the same thing, put a rebuild kit in it, does fine now.

powerdriver 1958 · 02-22-2009, 07:18 PM

Poke, the priming idea is a bad one.One backfire and you have a fire that you may not get out.I hope you don't take that the wrong way,just to many things to go wrong.Don't want anybody hurt.

pokethesmot · 02-22-2009, 08:20 PM

Quote:

Originally Posted by powerdriver 1958

Poke, the priming idea is a bad one.One backfire and you have a fire that you may not get out.I hope you don't take that the wrong way,just to many things to go wrong.Don't want anybody hurt.

oh since all i have to do is rebuild the carb then i don't plan on doing this idea

willett · 02-22-2009, 09:40 PM

you'll shoot your eye out kid

**N2TRUX** · 02-22-2009, 11:01 PM

Quote:

Originally Posted by willett

you'll shoot your eye out kid

That too funny.

Let us know if you need any input Poke.

02-22-2009, 03:47 AM	#1
pokethesmot profeshinaly unimployed Join Date: Dec 2008 Location: hazlehurst, GA Posts: 1,232	idea ok well i found out my truck will start if a put a little bit of fuel into the carb but now im wondering is there a way that i can wire a momentary switch up to the fuel pump to like prime the engine __________________ my ride click here my myspace "having mud flaps is like asking for a smaller trophy"

02-22-2009, 10:53 AM	#2
shadetree Senior Member Join Date: Dec 1999 Location: Knightstown, in, usa Posts: 2,525	Re: idea Why not fix the problem? It sounds like the accelerator pump on your carb (asuming it isn't fuel injected) is bad. A vacuum leak could be part of this issue, as could ignition timing/plugs/wires/cap & rotor, ect. __________________ 1970 long fleet, 355 4 speed, primer, walnut goodies

02-22-2009, 11:15 AM	#3
Restrorob The One And Only !!! Join Date: Jan 2007 Location: Hole in the woods Florida Posts: 4,567	Re: idea Unless you've added a electric fuel pump which should be activated soon as the key is turned on, It will be hard to hook a momentary switch to a mechanical pump. Sounds like the two welch plugs in the bottom of the float bowl, They start leaking fuel out of the bowl into the intake when the engine sits for long periods (over night). Then the engine must be cranked over enough to re-fill the fuel bowl before it will start. These leaking welch plugs can also cause bad fuel mileage. The fix is remove the carb and cover these two welch plugs with JB-Weld letting cure then re-install. __________________ 93 Jeep XJ 88 Buick La Sabra Toys; 88 TA-GTA in the works.... 97 GMC Ext. Cab 502 Crate 5 Spd......Sucks Gas But Haulz Azz ! The primary function of an Engineer is to make it difficult for the Fabricator and impossible for the Mechanic. *"Why go out preserved when you can go out beat up, worn out, sliding in sideways screaming, Holy Sh!t What A Ride" !!!*

02-22-2009, 01:03 PM	#5
Restrorob The One And Only !!! Join Date: Jan 2007 Location: Hole in the woods Florida Posts: 4,567	Re: idea Well, With the rest of the story now revealed, Replace the accelerator pump as shadetree suggest. __________________ 93 Jeep XJ 88 Buick La Sabra Toys; 88 TA-GTA in the works.... 97 GMC Ext. Cab 502 Crate 5 Spd......Sucks Gas But Haulz Azz ! The primary function of an Engineer is to make it difficult for the Fabricator and impossible for the Mechanic. *"Why go out preserved when you can go out beat up, worn out, sliding in sideways screaming, Holy Sh!t What A Ride" !!!* Last edited by Restrorob; 02-22-2009 at 01:04 PM.

02-22-2009, 01:34 PM	#6
pokethesmot profeshinaly unimployed Join Date: Dec 2008 Location: hazlehurst, GA Posts: 1,232	Re: idea now the accelerator pump is just the fuel pump right? __________________ my ride click here my myspace "having mud flaps is like asking for a smaller trophy"

02-22-2009, 01:43 PM	#7
54Caddy GM Addicted Join Date: Jan 2009 Location: Visalia, Ca Posts: 2,294	Re: idea The accelerator pump is the pump in your carburetor. What kind of carb are you running?

02-22-2009, 01:53 PM	#8
pokethesmot profeshinaly unimployed Join Date: Dec 2008 Location: hazlehurst, GA Posts: 1,232	Re: idea q jet __________________ my ride click here my myspace "having mud flaps is like asking for a smaller trophy"

02-22-2009, 02:06 PM	#9
54Caddy GM Addicted Join Date: Jan 2009 Location: Visalia, Ca Posts: 2,294	Re: idea Go down to a parts store and get you a rebuild kit for your carb. Or simply just get the accelerator pump. Or if you have the money it is worth getting an edelbrock carburetor they are great carbs.

02-22-2009, 02:38 PM	#10
powerdriver 1958 Kid's Mechanic Join Date: Nov 2006 Location: Kansas City Posts: 8,241	Re: idea ... Attached Images

02-22-2009, 02:50 PM	#11
Restrorob The One And Only !!! Join Date: Jan 2007 Location: Hole in the woods Florida Posts: 4,567	Re: idea Also, Take all the numbers off your carb with you to get the proper kit/pump. __________________ 93 Jeep XJ 88 Buick La Sabra Toys; 88 TA-GTA in the works.... 97 GMC Ext. Cab 502 Crate 5 Spd......Sucks Gas But Haulz Azz ! The primary function of an Engineer is to make it difficult for the Fabricator and impossible for the Mechanic. *"Why go out preserved when you can go out beat up, worn out, sliding in sideways screaming, Holy Sh!t What A Ride" !!!* Last edited by Restrorob; 02-22-2009 at 02:54 PM.

02-22-2009, 02:40 PM	#12
pokethesmot profeshinaly unimployed Join Date: Dec 2008 Location: hazlehurst, GA Posts: 1,232	Re: idea when i pump the gas all the lincage and stuff to the accelerator pump moves but like still i see no fuel goin into the carb __________________ my ride click here my myspace "having mud flaps is like asking for a smaller trophy"

02-22-2009, 02:49 PM	#13
N2TRUX Happy to be here Join Date: Mar 2000 Location: Cypress, TX Posts: 39,021	Re: idea Once again, it "sounds" like the accelarator pump in the carb. If you don't think you are capable of replacing the pump, see if you can't find someone local that can help. We don't mind giving advice, but you should be willing to accept it if you ask.... __________________ Follow me on Facebook and Instagram @N2trux.com Articles- "Jake" the 84 to 74 crewcab "Elwood" the77_Remix 85 GMC Sierra "Scarlett" "Refining Sierra"

02-22-2009, 03:09 PM	#15
powerdriver 1958 Kid's Mechanic Join Date: Nov 2006 Location: Kansas City Posts: 8,241	Re: idea If you try to rebuild yourself here's a link http://www.4wheelnoffroad.com/qjet.html

02-22-2009, 07:18 PM	#17
powerdriver 1958 Kid's Mechanic Join Date: Nov 2006 Location: Kansas City Posts: 8,241	Re: idea Poke, the priming idea is a bad one.One backfire and you have a fire that you may not get out.I hope you don't take that the wrong way,just to many things to go wrong.Don't want anybody hurt.

02-22-2009, 09:40 PM	#19
willett Another Day, Another Dollar Join Date: Nov 2008 Location: North Vancouver, BC Posts: 1,316	Re: idea you'll shoot your eye out kid __________________ -78 K20 Cheyenne 454 long box, 4" lift, 35" MT's, '84 cab, '80 box "its hip to be square"



Register or Log In To remove these advertisements.

Thread Tools
Show Printable Version Email this Page
Display Modes
Switch to Linear Mode Hybrid Mode Switch to Threaded Mode

Register or Log In To remove these advertisements.