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Old 03-09-2013, 06:12 PM
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thx Pat and Greg, so do you two also think if I get a low enough PSI unit that theres no way the carb will flood or overflow? Like is the psi so low that even if its left on a return line won't be needed and the clip on the carb flots holding back the needle tip at the end of the fuel line that goes up front won't be forced opened or anything?

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Old 03-09-2013, 09:12 PM
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A stock fuel pump should be just fine - no need for special mods with this simple setup. Are you sure your pusing the pump lever far enough to test it - they push VERY hard - probably need to hold it in a vise. The pump eccentric is oblonged to make the pump work - and must be on because that would also hold on the timing gear - unless for some reason it came loose (not tightened correctly when put on). The pump will/should prime itself when the engine is cranking over. Test the output into a can and if it is pumping, the gas will pump into the can. If it pumps in, I would think the fuel issue should be fine unless there is some blockage. ??
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Old 03-09-2013, 09:19 PM
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Quote:
Originally Posted by 33Willys77 View Post
A stock fuel pump should be just fine - no need for special mods with this simple setup. Are you sure your pusing the pump lever far enough to test it - they push VERY hard - probably need to hold it in a vise. The pump eccentric is oblonged to make the pump work - and must be on because that would also hold on the timing gear - unless for some reason it came loose (not tightened correctly when put on). The pump will/should prime itself when the engine is cranking over. Test the output into a can and if it is pumping, the gas will pump into the can. If it pumps in, I would think the fuel issue should be fine unless there is some blockage. ??
Yea I know there is no blockage I cleaned those lines really good and probably about ten times. I didn't use a vice but I thought I should had put it in somethinng and put some real force on that arm. I'll inspect the eccentric, and the t chain and its gear. I'll just replace them all anyways just to be replacing I guess. I definitely can't spend 81 dollars on an elec pump though but those other parts might need replace because like I said the motor mount did break in the past leading to a bad ride and my fan eating my radiator.
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Old 03-10-2013, 10:48 AM
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An electric pump at 6 PSI is just like a mechanical pump at 6 PSI. The carb will behave the same way it would with a good factory mechanical pump. I'm not sure about the P.P. pump mentioned before my post, but the Carter I mentioned does not require a bypass type pressure regulator. Other, similar looking Carter's might require a regulator in your application, but the one mentioned will likely not require a regulator at all. If there is an issue with your carb using this pump, the issue is almost certainly with your carb. I know that isn't what you want to hear, but I do believe it's what you need to be told.

Good luck with this. I hope that you're able to get your truck's issue resolved.

PatM
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Old 03-18-2013, 02:00 AM
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how does one check a mechanical fuel pump externally? Would I just need to buy a brand new pump and put it in and if it doesnt work that means the eccentric is messed up which means my old pump is probably still good? I really need to just find a way to test the pump while its out period because a 25 dollar pump is going to bite into my budget and I need to know what I can avoid buyin or what I can take back to recoup some losses.
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Old 03-18-2013, 07:20 AM
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Although it is not common to get a bad pump, you could get one. Clamp the pump in a vise and put your finger on the inlet side, then push the pump lever (very hard). You will feel the pull on your finger. If you have it in the truck, spin the engine over (dont start it) and put the fuel line in a can and see if it is pumping the fuel.
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Old 03-18-2013, 07:31 AM
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Old 03-18-2013, 08:00 AM
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regards to oldndusty's post - Do not go by the 1987-1989 14.5 psi, that is not for a carbed motor.
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Old 03-18-2013, 09:36 AM
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oh yea i know now that it needs like 4 or 6 psi. i have bought I think 2 bad ones brand in the past thats just why I had been paranoid about it.
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