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1979 GMC Serria Pickup Fuel pump problem
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jypflash
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Jan 4, 2009, 9:52 AM
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1979 GMC Serria Pickup Fuel pump problem
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Installed new fuel pump and still wont pump fuel. Will start if pour fuel in carberator but wont continue to run on it's own. Any suggestions? Thank you
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way2old
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Jan 4, 2009, 9:57 AM
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Re: 1979 GMC Serria Pickup Fuel pump problem
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Not to question your ability, but are you sure the pump lever is located properly on the crank? I have seen a lot of them installed first with the lever on the wrong side. I have done a few myself. Also look to be sure there are no holes in the line where it might suck some air. Maybe look for a collapsed line somewhere also.
Being way2old is why I need help from younger minds
(This post was edited by way2old on Jan 4, 2009, 10:01 AM)
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jypflash
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Jan 4, 2009, 11:19 AM
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Re: 1979 GMC Serria Pickup Fuel pump problem
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way2old, thanks for your reply. Pretty sure pump lever is in right position and no holes or crimps in line. Was wondering if line with fuel filter would need to have fuel put into it to fill, or prime, the fuel line. I don't know much about mechanics. What do you think? Thanks for your help.
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way2old
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Jan 4, 2009, 11:59 AM
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Re: 1979 GMC Serria Pickup Fuel pump problem
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If you can get it to run by putting fuel in carb, that should prime the pump and lines. The hoses are on the proper connectors? In other words, are you sure the lines are not crossed? Been years since I have worked with a mechanical pump so bear with me on these. You can take the line off the filter and see if any fuel is coming out when cranking. You may want to install longer hose and place into a jar. Also, did you replace the filter?
Being way2old is why I need help from younger minds
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jypflash
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Jan 4, 2009, 12:10 PM
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Re: 1979 GMC Serria Pickup Fuel pump problem
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way2old, I did replace fuel filter. May have got the lines crossed but don't think so.
way2old, I did replace filter and don't think lines are crossed but will check that out. Can't do it today though mabe that's my problem, sure hope so. thanks for you help.
will
(This post was edited by way2old on Jan 4, 2009, 3:06 PM)
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Loren Champlain Sr
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Jan 5, 2009, 5:36 PM
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Re: 1979 GMC Serria Pickup Fuel pump problem
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Pardon me jumping in here; When you removed the original fuel pump, there is a "push rod" that can drop down it's bore. It is about 5/8" diameter and about 4" long. You must make sure that the rod is pushed upwards before you install the new pump. The rod makes contact with the 'lever' on the fuel pump. You will notice that there are two 7/16 bolts holding the cover to the block. I've had to, many times, remove the cover, put grease on the rod, push it back into the bore to hold it in place while putting the fuel pump back in. You'll need a new gasket for that cover.
Loren
SW Washington
(This post was edited by Loren Champlain Sr on Jan 5, 2009, 5:39 PM)
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Tom Greenleaf
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Jan 5, 2009, 5:50 PM
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Re: 1979 GMC Serria Pickup Fuel pump problem
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Of course I can't leave my nose out of this either! So far - I've never been able to get a fuel pump in if the pushrod is down and tighten up the fuel pump - perhaps it's possible??
I have done battle with the sucker falling down too quick and one gave me so much sh*t nothing was working, grease, wires so I jacked up the vehicle on that side only at the safest max I could and son of a gun push rod didn't fall at that angle! that's a pretty dramatic angle and all safety taken very seriously if attempted with doubled up stands etc.
I'm only somewhat sure that one fuel line to carb is all metal all the way but may have been changed to rubber by now and a mix up could happen. Again so far I haven't had to wet prime a mechanical pump but may take some cranking to get it going.
At the age, if there's a rusty line from it to the tank it might be sucking air!
T
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Loren Champlain Sr
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Jan 5, 2009, 5:58 PM
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Re: 1979 GMC Serria Pickup Fuel pump problem
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Tom; You are too funny! Yeah, it's possible. As the pump is tightened, the lever is pushed backwards towards the pump. I'm pretty sure the old Chevs ran the pushrod off of a cam lobe. Would be rare, but not impossible, for the lobe to go flat. That would suck.
Loren
SW Washington
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Tom Greenleaf
Ultimate Carjunky
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Jan 5, 2009, 6:12 PM
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Re: 1979 GMC Serria Pickup Fuel pump problem
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Don't recall the exact layout but it should have used a pushrod to a lifter type thingy right at the pump end. I'm thinking of the GM "V" engines and can't recall what the in line six did if that is this engine.
The car I tilted first was a Monte Carlo with a 229V6 - pretty sure?? Have done it to others after finding that bought just enough time to get in there with the lever in place properly
Hey - if customers were watching you had to send them for a walk and not watch for that trick! LOL!
T
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