Won't Start - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Curly86 · 05-06-2007, 10:18 AM

I recently bought a 78 GMC midas RV for $900 it was running when I bought it got it home and parked it to start reworking it and i moved it in the yard and now it won't start not getting fuel to the fuel pump. It has a 350 with a QJ. Any ideas why?

krue · 05-06-2007, 10:20 AM

Filter? Sock in the tank? Level in the tank? (that's the first thing I would check).

Curly86 · 05-06-2007, 10:26 AM

It has plenty of gas and it was running fine till then. What would be the best way to blow out the gas line from the tank to the fuel pump? tks

Restrorob · 05-06-2007, 10:33 AM

I agree with krue on the sock, You could remove the gas cap and apply air through the line from the pump to back flush the sock. Sometimes if they are badly plugged the air will blow it off the pick-up tube, Which wouldn't be a bad thing as long as there is a in-line filter.

blazer2007 · 05-06-2007, 10:34 AM

every time mine won,t start was always coil or module in dist. ,you didn,t say if you had spark

blazer2007 · 05-06-2007, 10:34 AM

sorry read post wrong

**N2TRUX** · 05-06-2007, 11:13 PM

Lets start with the basics. How do you know it's not getting fuel to the pump? If you are sure it's not getting fuel to the pump, it could be the pump. If it has been sitting a while before you got it the diaphragm in the pump could have dried out.

Give us more details so we don't have to speculate so much.

Curly86 · 05-12-2007, 02:33 AM

I took off the line from the fuel pump to the carb. and turned the engine over a few times and no fuel came out also will check the fuel lines to see if they r ok

**N2TRUX** · 05-12-2007, 09:09 AM

If you have a compressor, pressurize the tank. Take a rag and wrap it around the filler tube and blow air in the tank. This could help free any restrictions. If that doesn't help, take the line off "before" the fuel pump and try again. If you get fuel out of the line, your pump is shot.

knightlife · 05-12-2007, 10:36 AM

when you turn the key on, do you have fuel pressure from the fuel line running to the carb? if not, could be a grounding issue on the fuel pump...

**N2TRUX** · 05-12-2007, 10:58 AM

Quote:

Curly86- I took off the line from the fuel pump to the carb. and turned the engine over a few times and no fuel came out

Quote:

Originally Posted by knightlife

when you turn the key on, do you have fuel pressure from the fuel line running to the carb? if not, could be a grounding issue on the fuel pump...

I will assume that it's a manual fuel pump. That would eliminate a grounding problem.

Curly86 · 05-12-2007, 11:39 PM

Yes it is a manuel pump and i will try that next weekend don't have time to work on it now tks

05-06-2007, 10:18 AM	#1
Curly86 You want it there when??? Join Date: Oct 2006 Location: Lewisburg Ky Posts: 393	Won't Start I recently bought a 78 GMC midas RV for $900 it was running when I bought it got it home and parked it to start reworking it and i moved it in the yard and now it won't start not getting fuel to the fuel pump. It has a 350 with a QJ. Any ideas why? __________________ 1986 Silverado Flatbed 400 SB with 350 turbo 1997 Ford Explorer with 302 mydrive to work ride 1978 Gmc Midas RV 21ft with 46,000 actual miles 2003 Chevy Avalanche 5.3 327 and Tweety Bird Yellow Big Sandy Survivor 09 Trucks in the Blue Grass Survivor 09 TNCTC Streetcruzin

05-06-2007, 10:20 AM	#2
krue Designated A-hole! Join Date: Mar 2003 Location: South Mississippi Posts: 36,448	Re: Won't Start Filter? Sock in the tank? Level in the tank? (that's the first thing I would check). __________________ "If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck"

05-06-2007, 10:26 AM	#3
Curly86 You want it there when??? Join Date: Oct 2006 Location: Lewisburg Ky Posts: 393	Re: Won't Start It has plenty of gas and it was running fine till then. What would be the best way to blow out the gas line from the tank to the fuel pump? tks __________________ 1986 Silverado Flatbed 400 SB with 350 turbo 1997 Ford Explorer with 302 mydrive to work ride 1978 Gmc Midas RV 21ft with 46,000 actual miles 2003 Chevy Avalanche 5.3 327 and Tweety Bird Yellow Big Sandy Survivor 09 Trucks in the Blue Grass Survivor 09 TNCTC Streetcruzin

05-06-2007, 10:33 AM	#4
Restrorob The One And Only !!! Join Date: Jan 2007 Location: Hole in the woods Florida Posts: 4,567	Re: Won't Start I agree with krue on the sock, You could remove the gas cap and apply air through the line from the pump to back flush the sock. Sometimes if they are badly plugged the air will blow it off the pick-up tube, Which wouldn't be a bad thing as long as there is a in-line filter. __________________ 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" !!!*

05-06-2007, 10:34 AM	#5
blazer2007 Registered User Join Date: Jan 2007 Location: vernon b.c. Posts: 3,022	Re: Won't Start every time mine won,t start was always coil or module in dist. ,you didn,t say if you had spark

05-06-2007, 10:34 AM	#6
blazer2007 Registered User Join Date: Jan 2007 Location: vernon b.c. Posts: 3,022	Re: Won't Start sorry read post wrong

05-06-2007, 11:13 PM	#7
N2TRUX Happy to be here Join Date: Mar 2000 Location: Cypress, TX Posts: 39,021	Re: Won't Start Lets start with the basics. How do you know it's not getting fuel to the pump? If you are sure it's not getting fuel to the pump, it could be the pump. If it has been sitting a while before you got it the diaphragm in the pump could have dried out. Give us more details so we don't have to speculate so much. __________________ Follow me on Facebook and Instagram @N2trux.com Articles- "Jake" the 84 to 74 crewcab "Elwood" the77_Remix 85 GMC Sierra "Scarlett" "Refining Sierra"

05-12-2007, 02:33 AM	#8
Curly86 You want it there when??? Join Date: Oct 2006 Location: Lewisburg Ky Posts: 393	Re: Won't Start I took off the line from the fuel pump to the carb. and turned the engine over a few times and no fuel came out also will check the fuel lines to see if they r ok __________________ 1986 Silverado Flatbed 400 SB with 350 turbo 1997 Ford Explorer with 302 mydrive to work ride 1978 Gmc Midas RV 21ft with 46,000 actual miles 2003 Chevy Avalanche 5.3 327 and Tweety Bird Yellow Big Sandy Survivor 09 Trucks in the Blue Grass Survivor 09 TNCTC Streetcruzin

05-12-2007, 09:09 AM	#9
N2TRUX Happy to be here Join Date: Mar 2000 Location: Cypress, TX Posts: 39,021	Re: Won't Start If you have a compressor, pressurize the tank. Take a rag and wrap it around the filler tube and blow air in the tank. This could help free any restrictions. If that doesn't help, take the line off "before" the fuel pump and try again. If you get fuel out of the line, your pump is shot. __________________ Follow me on Facebook and Instagram @N2trux.com Articles- "Jake" the 84 to 74 crewcab "Elwood" the77_Remix 85 GMC Sierra "Scarlett" "Refining Sierra"

05-12-2007, 10:36 AM	#10
knightlife Dark Heart Motorsports Join Date: Apr 2007 Location: 29404 DKFX Posts: 683	Re: Won't Start when you turn the key on, do you have fuel pressure from the fuel line running to the carb? if not, could be a grounding issue on the fuel pump... __________________ How Deep Can YOU Bleed..? 1985 Chevy Blazer K5- 6.2 N/A, 400 turbo trans CUCV, 12v converted... a new chapter 2005 GMC Sierra Crew Cab 6.0 powwwaa!!! custom jumpseat install w/ captain seats, Hypertech tuner, MSD Blaster Coils, CB and twin antenna's, all electric interior, touch screen in dash. custom center console, with jump seat replacing original console. 1500 HD!

05-12-2007, 11:39 PM	#12
Curly86 You want it there when??? Join Date: Oct 2006 Location: Lewisburg Ky Posts: 393	Re: Won't Start Yes it is a manuel pump and i will try that next weekend don't have time to work on it now tks __________________ 1986 Silverado Flatbed 400 SB with 350 turbo 1997 Ford Explorer with 302 mydrive to work ride 1978 Gmc Midas RV 21ft with 46,000 actual miles 2003 Chevy Avalanche 5.3 327 and Tweety Bird Yellow Big Sandy Survivor 09 Trucks in the Blue Grass Survivor 09 TNCTC Streetcruzin



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