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Old 04-08-2018, 09:40 PM   #1
Domingo
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1968 c10 died

1968 c10. Died on my son Wednesday, got it home and the fuel bowls empty. I tought fuel pump, replace with a new acdelco from summit racing, now Sunday truck dies again. Replaced the fuel filter as well.
One thing the has me concern the fuel line coming from the tank to the fuel pump it was dry. Could it be a plugged gas pick up it has a 21 gallon gas tank from brothers(blazer) 4 years old
any ideas could it just be another bad pump
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Old 04-08-2018, 10:18 PM   #2
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Re: 1968 c10 died

Could be plugged or since it is a suction line it could have a hole somewhere before the tank allowing it to suck air and not fuel. Or the really annoying and hard to find, flap of loose rubber inside of the hose. ( been there it took days of frustration and some luck to solve)
Test your pump by running a suction line from it to a can of gas and crank the truck to see if the float bowl fills up. With the gas we have to use nowdays it isn't out of the question for a hose to fail in four years.
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Old 04-09-2018, 02:52 PM   #3
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Re: 1968 c10 died

Could be vaporlock. How warm was it there on the days you had the problem? We have 10% ethanol here and it will start to boil in the fuel line at 190 degrees. We had a couple of 80 degree days and my truck sat down on me. I had a clear fuel filter and I could watch it boil and turn to vapor. Just a thought.
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Old 04-09-2018, 08:10 PM   #4
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Re: 1968 c10 died

The fuel sock on the fuel pickup line inside the tank could be plugged. Pull the tank sending unit out and check it
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Old 04-09-2018, 08:24 PM   #5
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Re: 1968 c10 died

The temp was about 75, I dont think it was vapor lock.
I'm going to replace all the rubber lines with steel and drop and check the tank
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Old 04-09-2018, 11:59 PM   #6
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Re: 1968 c10 died

Update. Removed tank, tank was clean. Braided fuel hose was dry and falling apart, maybe it was collapsing and keeping fuel from getting to fuel pump
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Old 04-10-2018, 07:29 AM   #7
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Re: 1968 c10 died

First of all, these trucks don't die, they just need some health care from time to time. The line could very well be collapsing. Do you mean the short piece at the tank outlet that allows for body to chassis flex, or did someone replace the hard line to the pump with something that doesn't belong, known to result in issues on down the road? Same for pump to carb, should be hard line all the way.
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Old 04-10-2018, 09:02 AM   #8
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Re: 1968 c10 died

It was about 3 feet of rubber line I'm going to replace with hard line from the tank to the pump
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Old 04-10-2018, 05:27 PM   #9
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Re: 1968 c10 died

sub'd
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Old 04-10-2018, 07:10 PM   #10
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Re: 1968 c10 died

Clogged vent in the tank would cause it to run for a while, be k, then not be able to suck anymore fuel as the vacuum in the tank would overcome the suction of the pump.

Loosen or pull off the gas cap and try again.
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Old 04-11-2018, 09:33 PM   #11
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Re: 1968 c10 died

Definitely was to get rid of that cobble job fuel line. It needs to be metal to be right and safer.
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Old 04-14-2018, 11:24 PM   #12
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Re: 1968 c10 died

Im back. Removed tank replace all rubber hose with metal line tonight my son and I tried to fire it up no luck. Removed pump and behold the lever was broken what gives
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Old 04-15-2018, 05:04 AM   #13
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Re: 1968 c10 died

Never seen that before. I use electric pumps though.
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Old 04-15-2018, 02:44 PM   #14
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Re: 1968 c10 died

Someone correct me if I am wrong but it may be possible to install the pump with the lever on the top of the cam if the lobe is in just the right position. I've seen this on a non Chevy engine before. Or simply just another quality part from a distant shore.
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Old 04-15-2018, 02:49 PM   #15
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Re: 1968 c10 died

Quote:
Originally Posted by HO455 View Post
Someone correct me if I am wrong but it may be possible to install the pump with the lever on the top of the cam if the lobe is in just the right position. I've seen this on a non Chevy engine before. Or simply just another quality part from a distant shore.
You can do that on Ponchos and Fords, but the lever is too short on the Chevy pump.
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Old 04-15-2018, 03:02 PM   #16
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Re: 1968 c10 died

Its been awhile since highschool auto shop, too long to remember what car it happened to. I think it might have been a friends Ranchero. I do remember the lesson about it and how the oil pan had to come off the get the missing end of the lever. I must have learned the lesson well enough. I've done at least half dozen Poncho pumps over the years and never had to pull the pan. (Yet!!!)
Thanks for the information.
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1967 Burban the WMB,1991 S(stink)-10 Blazer,1969 GTO, 1970 Javelin, 1952 F2 Ford 4X4, 29 Model A, 72 Firebird. 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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Old 04-15-2018, 04:24 PM   #17
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Re: 1968 c10 died

When replacing the pump there is a bolt on the block that will hold the internal shaft in place during the installation

Last time I replaced mine there were some pumps that were really cheap that stated that they were for the non-ethanol fuel
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Old 04-15-2018, 04:57 PM   #18
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Re: 1968 c10 died

Quote:
Originally Posted by Domingo View Post
Im back. Removed tank replace all rubber hose with metal line tonight my son and I tried to fire it up no luck. Removed pump and behold the lever was broken what gives
That doesn't look like a Delco pump. Inferior parts is my guess.
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Old 04-15-2018, 06:58 PM   #19
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Re: 1968 c10 died

Quote:
Originally Posted by Domingo View Post
Im back. Removed tank replace all rubber hose with metal line tonight my son and I tried to fire it up no luck. Removed pump and behold the lever was broken what gives
Didn't see that earlier. I'd say it's defective. I've never seen anything like that, in many years of wrenching.
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Old 04-15-2018, 07:40 PM   #20
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Re: 1968 c10 died

Delco isn't what it used to be. The last AC/Delco part I bought from a dealer had "made in China" stamped on it.
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Old 04-15-2018, 08:02 PM   #21
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Re: 1968 c10 died

I bought the pump from summit racing. Now I'm buying another from napa auto parts. Summit racing refunded my money no question asked. They are great and will keep getting my business
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Old 04-15-2018, 08:02 PM   #22
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Re: 1968 c10 died

Just now I got a bad taste of ac delco parts
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Old 04-15-2018, 11:37 PM   #23
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Re: 1968 c10 died

Quote:
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Delco isn't what it used to be. The last AC/Delco part I bought from a dealer had "made in China" stamped on it.
I had a '68 skylark GS that I went large with a Chevy engine, and put a 4-row truck radiator in it. I went to the Chevy dealer to get the top clamps (where better to get the part, right?) and they were made in China.

[political "rant"] China will end up owning the US as the infrastructure continues to be off-shored. [/political "rant"]
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Old 04-15-2018, 11:53 PM   #24
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Re: 1968 c10 died

A number of years ago I had a 66 corvette with a 327. When I got it, it worked OK, unless you got on it. Then about haflway thru third gear it would just die. Pull over to the side, crank for a few seconds on it was OK again. Turned out that the pivot lever for the fuel pump had fallen out. The lever then moved out of position, but only a little bit as it ran into the inside wall of the pump body. This resulted in it getting about a third of the intended stroke on the lever. So long as there wasn't much demand, it could keep up, but when you started burning some fuel it couldn't.
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