my truck wont start? Fuelpump dead? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**passthebuck** · 10-19-2003, 11:03 PM

Hey all. My truck once in a while wont start. I drove it home 600 miles with no problem & it stalled after hitting a bump in front of my house & I went out about an hour later & it started. It ran this afternoon but when I tried to start it to put it back into the garage-no go. It started for about two seconds & died & wont start. It sat for 14 years prior to my getting it & I'm THINKING that an intermittantly failing fuel pump would cause such a situation. Comments? Has anyone had a fuelpump that works & then stops & then goes again? What do you think?

70c10 · 10-19-2003, 11:30 PM

When my last pump went up it started to leak.

Fred T · 10-19-2003, 11:37 PM

My first guess would be something in the ignition system. I would first check for spark.

To check the fuel system, disconnect the fuel line going to the carb and stick it in a clear container, such as a pop bottle. Have someone crank the engine and see if you're getting fuel. If no fuel is pumped, next check is to see if fuel flows out the tank. Also if you have a fuel filter in line, check it for flow.

Cat Fuzz · 10-19-2003, 11:57 PM

Its not the fuel pump. Gotta be a loose connection in the ignition system.

Unless you have an electric fuel pump and it has a loose connection.

O'l Buck · 10-20-2003, 02:36 AM

usually when a fuel pump goes (mechanical), the engine will run like crap if at all. However, my truck acted about like you describe for awhile, turned out to be the fuel filter. Sitting that long, you might have jarred a little rust out of the line or something when you hit the bump and it was enough to clog the filter, then when it cools, the crap settles down, then gets picked back up agian.....wierd things happen with old trucks.....or anything with wheels......or mechanical for that matter.

**passthebuck** · 10-21-2003, 10:00 PM

So I was thinking about how the truck started & ran for a few seconds & died. I still figured it was fuel & an ez way to check that was to pour a spraycan cap full of gas down the carb & start it up. It ran & died in about 4 seconds. A-HA! Its either fuel pump OR a fuel filter. I unhooked the hardline at the carb & cranked it & fuel went EVERYWHERE. The previous owner cut the hardline & put an aftermarket steel filter. I unhooked it & outcame stuff that looked like fine coffee grounds! A new filter & she ran a-ok. I'm thinking that I should keep an extra one in the glovebax should I ever need to do it again & I think I will due to the krap in the filter. I'm thinking that after I get it road-legal I've gotta get that tank steam cleaned. Thanks to all you cats who replied to my post!

Denny · 10-21-2003, 10:18 PM

That rust in the gas tank can get real aggrevating. I put a new gas tank in my truck a couple years ago and just put all stainless gas lines on her this year. I was real surprised to see how much rust coating was in the gas line that runs to the pump from the tank. I guess 34 years is a long time on fuel lines and gas tanks.

10-19-2003, 11:03 PM	#1
passthebuck Sisyphus was my mentor! Join Date: Sep 2002 Location: Carleton Place, Ontario CANADA Posts: 984	my truck wont start? Fuelpump dead? Hey all. My truck once in a while wont start. I drove it home 600 miles with no problem & it stalled after hitting a bump in front of my house & I went out about an hour later & it started. It ran this afternoon but when I tried to start it to put it back into the garage-no go. It started for about two seconds & died & wont start. It sat for 14 years prior to my getting it & I'm THINKING that an intermittantly failing fuel pump would cause such a situation. Comments? Has anyone had a fuelpump that works & then stops & then goes again? What do you think? __________________ passthebuck #5642 -TWO 1967 GMC 910's. One with L6/3-on-the tree and the other with 355 w/435hp & a 700r4. -a 2013 Honda Civic as my "sensible" car

10-19-2003, 11:30 PM	#2
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,857	When my last pump went up it started to leak. __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads

10-19-2003, 11:37 PM	#3
Fred T Cantankerous Geezer Join Date: Aug 2002 Location: Bel Aire, KS Posts: 6,264	My first guess would be something in the ignition system. I would first check for spark. To check the fuel system, disconnect the fuel line going to the carb and stick it in a clear container, such as a pop bottle. Have someone crank the engine and see if you're getting fuel. If no fuel is pumped, next check is to see if fuel flows out the tank. Also if you have a fuel filter in line, check it for flow. __________________ Fred There is no such thing as too much cam...just not enough engine.

10-20-2003, 02:36 AM	#5
O'l Buck Recovering Truck Driver Join Date: Mar 2002 Location: Orleans, NE USA Posts: 1,883	usually when a fuel pump goes (mechanical), the engine will run like crap if at all. However, my truck acted about like you describe for awhile, turned out to be the fuel filter. Sitting that long, you might have jarred a little rust out of the line or something when you hit the bump and it was enough to clog the filter, then when it cools, the crap settles down, then gets picked back up agian.....wierd things happen with old trucks.....or anything with wheels......or mechanical for that matter. __________________ 67 K-20 350, SM465, Eaton rear, 4.56 no spin option 00 Dodge 2500 4x4, 24V cummins, 5 speed Chad South Central Nebraska

10-21-2003, 10:00 PM	#6
passthebuck Sisyphus was my mentor! Join Date: Sep 2002 Location: Carleton Place, Ontario CANADA Posts: 984	update So I was thinking about how the truck started & ran for a few seconds & died. I still figured it was fuel & an ez way to check that was to pour a spraycan cap full of gas down the carb & start it up. It ran & died in about 4 seconds. A-HA! Its either fuel pump OR a fuel filter. I unhooked the hardline at the carb & cranked it & fuel went EVERYWHERE. The previous owner cut the hardline & put an aftermarket steel filter. I unhooked it & outcame stuff that looked like fine coffee grounds! A new filter & she ran a-ok. I'm thinking that I should keep an extra one in the glovebax should I ever need to do it again & I think I will due to the krap in the filter. I'm thinking that after I get it road-legal I've gotta get that tank steam cleaned. Thanks to all you cats who replied to my post! __________________ passthebuck #5642 -TWO 1967 GMC 910's. One with L6/3-on-the tree and the other with 355 w/435hp & a 700r4. -a 2013 Honda Civic as my "sensible" car

10-19-2003, 11:57 PM	#4
Cat Fuzz My son, my joy. Join Date: Sep 2003 Location: Spokane WA Posts: 463	Its not the fuel pump. Gotta be a loose connection in the ignition system. Unless you have an electric fuel pump and it has a loose connection.

10-21-2003, 10:18 PM	#7
Denny Registered User Join Date: Jul 2002 Location: Cedar Hill, MO Posts: 426	That rust in the gas tank can get real aggrevating. I put a new gas tank in my truck a couple years ago and just put all stainless gas lines on her this year. I was real surprised to see how much rust coating was in the gas line that runs to the pump from the tank. I guess 34 years is a long time on fuel lines and gas tanks. __________________ 1969 Chevy C10. Dakota Digital Gauges, 383 Votex Engine, MSD 8361 Distributor, MSD 6A Unit, Demon Carb, Phoenix Transmission 4L80E trans, 3:73 Posi Rear End Early Classics 6 Lug Disc Brakes and Spindles All Stainless Lines



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