New Fuel Pump Won't Work, Help,, Help.. - Team Camaro Tech
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post #1 of 8 (permalink) Old Aug 24th, 08, 02:07 PM Thread Starter
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Dale
 
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New Fuel Pump Won't Work, Help,, Help..

Hi All.. Well I'm still trying to get this 1974 455 to run in my 68 bird.. I tried to start it this time and the old mechanical fuel pump did not pump up gas,, so I bought a new one,, and it won't pump gas either ,, the gas will come up to the pump it seems, because I took the new one back off and a little gas dribbled out of the pump.. I disconnected the fuel line at the gas tank and I got an eye full... ... last year the old pump would shoot gas out all over the place,, this year nothing, what could have happened to the old pump from last year,??.. and why will the new fuel pump not work like it's suppose to../??... I hope you guys can help,, it's still a Gm motor,, Thanks..

When You Turn Your Car On,, Does It Return The Favor,??.. NO!.. Butt,, I hope to Change That Soon..
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post #2 of 8 (permalink) Old Aug 24th, 08, 03:05 PM
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Re: New Fuel Pump Won't Work, Help,, Help..

There appears to be a restriction somewhere!.....You probably got a piece of "firebird poop" clogging up the fuel line!
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post #3 of 8 (permalink) Old Aug 24th, 08, 03:18 PM
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Re: New Fuel Pump Won't Work, Help,, Help..

I agree, there is probably a restriction somewhere. If you have had the lines open for a while something like a dirt dauber could have plugged the line. Or you may have a restriction caused by one of the following, a restricted in tank fuel strainer, a deteriorated rubber line that has internally collapsed, a kinked hose or bent metal line. I would take the line at the tank and blow air through it. If it is free there, you probably have a stopped up fuel strainer in the tank. Or I guess you could just have 2 defective pumps, but I doubt it. Have you checked to make sure that there is plenty of gas? I'm not trying to be wise, but we all forget things sometimes.
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post #4 of 8 (permalink) Old Aug 24th, 08, 03:24 PM
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Re: New Fuel Pump Won't Work, Help,, Help..

probably just debris in the line but you could have wiped the fuel pump lobe on the cam...
I'm assuming you got the rod in place where it needs to be.
I don't know much about Pontiac's but on some Chevy's you can put a bolt in the block to hold the fuel rod in place to make it easier to install... if you did this, did you remove it?

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post #5 of 8 (permalink) Old Aug 24th, 08, 07:25 PM Thread Starter
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Re: New Fuel Pump Won't Work, Help,, Help..

Quote:
Originally Posted by ace's68 View Post
probably just debris in the line but you could have wiped the fuel pump lobe on the cam...
I'm assuming you got the rod in place where it needs to be.
I don't know much about Pontiac's but on some Chevy's you can put a bolt in the block to hold the fuel rod in place to make it easier to install... if you did this, did you remove it?
Thats what I'm worried about,, when I took the old fuel pump off there was no rod... the pump was working fine months ago... I don't think pontiac motors use a rod like csb,, but I'm not for sure.. I'm afraid it might be something up inside like a cam got wiped.. or placement of the pump arm might not be in the right place... when I moved the old pump arm I could hear air pressure coming out the hole where the fuel is suppose to come out of.. I guess I'll try and find a pontiac motor diagrahm and see if I can figure that part out... I suppose the fuel line might be partially clogged, or the tank strainer might be the culprit... anybody got any thoughts or ideas will be greatly appreciated... Thanks

When You Turn Your Car On,, Does It Return The Favor,??.. NO!.. Butt,, I hope to Change That Soon..
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post #6 of 8 (permalink) Old Aug 25th, 08, 04:42 AM
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Re: New Fuel Pump Won't Work, Help,, Help..

Pontiac pumps use an arm and eccentric cam.
Disconnect the inlet fuel line from the pump and blow into the tank to prime all the fuel line up to the pump first.

Next, disconnect the outlet at pump and blow into it. If fuel level is low enough, the needle(s) should be open and allow blow-through. If not, then fuel level is high or needle(s) are stuck closed from dried gasoline. Smack carb body with a rubber hammer.

Pour gas through carb bowl vents and start engine. By the time fuel pump primes itself and fills supply line, it should start filling carb.

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post #7 of 8 (permalink) Old Aug 25th, 08, 06:01 AM
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Re: New Fuel Pump Won't Work, Help,, Help..

well if it is the worst case .. and your lobe is wiped you can always just run an electric pump instead they arent that difficult to hook up ...its a much easier option than replacing the cam thats for sure

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post #8 of 8 (permalink) Old Aug 25th, 08, 08:11 AM
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Re: New Fuel Pump Won't Work, Help,, Help..

Quote:
Originally Posted by Everett#2390 View Post
Pontiac pumps use an arm and eccentric cam.
Disconnect the inlet fuel line from the pump and blow into the tank to prime all the fuel line up to the pump first.

Next, disconnect the outlet at pump and blow into it. If fuel level is low enough, the needle(s) should be open and allow blow-through. If not, then fuel level is high or needle(s) are stuck closed from dried gasoline. Smack carb body with a rubber hammer.

Pour gas through carb bowl vents and start engine. By the time fuel pump primes itself and fills supply line, it should start filling carb.

Everett is correct, these Ponchos use a fuel pump eccentric , bolted to the cam gear. Sometimes the bolt gets loose and allows the eccentric to strip the "tab" off the eccentric. Long fuel pump arm rides on eccentric. You have to pull timing cover to get to this, not a biggie but while you are at it, replace the timing gear and chain. You may still have the plastic tooth cam gear.

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