Fuel pump not drawing from tank - El Camino Central Forum : Chevrolet El Camino Forums
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Old 11-11-2019, 01:38 PM
79 Caballero 79 Caballero is offline
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Default Fuel pump not drawing from tank

Yesterday i dropped the tank, emptied it, cleaned it, reinstalled. A few weeks ago i had my engone running for cam break in out of a gas can because i wasnt sure of my tank cleanliness. I have a holley electric pump and about 4 gallons of fresh gas in the tank but my pump will not draw from the tank. It will draw from a gas can. What do i need to do to maybe prime my pump/lines? I cant figure out why im not getting gas.
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Old 11-11-2019, 01:50 PM
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Default Fuel pump not drawing from tank

Quote:
Originally Posted by 79 Caballero View Post
Yesterday i dropped the tank, emptied it, cleaned it, reinstalled. A few weeks ago i had my engine running for cam break in out of a gas can because i wasnt sure of my tank cleanliness. I have a holley electric pump and about 4 gallons of fresh gas in the tank but my pump will not draw from the tank. It will draw from a gas can. What do i need to do to maybe prime my pump/lines? I cant figure out why im not getting gas.
Elect pump will pump,, if has fuel, try to pump into a can. If that is not the deal, then line is A,plugged/kinked, B line has "crack,leak" sucking air. How far from tank is it and is it stock? ..
Just set mine up and took an sir hose blew threw it Prior to hooking up the elect pump, no problems.. Old hose will cause troble if an elect is set up after market ..My 2 p.
Chuck
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Old 11-11-2019, 02:04 PM
79 Caballero 79 Caballero is offline
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I replaced the two rubber hose pieces coming off the sender. I also replaced the two small pieces just forward of the tank. I thought from tgere it was all hardline up among the frame. Is there more soft line i need to look at in those areas?
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Old 11-11-2019, 02:19 PM
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Quote:
Originally Posted by LilBrownJug View Post
Elect pump will pump,, if has fuel, try to pump into a can. If that is not the deal, then line is A,plugged/kinked, B line has "crack,leak" sucking air. How far from tank is it and is it stock? ..
Just set mine up and took an sir hose blew threw it Prior to hooking up the elect pump, no problems.. Old hose will cause troble if an elect is set up after market ..My 2 p.
Chuck
lol Pumps dont pump they suck, and if you want to get technical they drastically reduce atmospheric pressure.

first question:
is the Holley pump new never used? maybe you have the inlet to the pump confused with the outlet, is there a suction filter before the pump?



second question:

is the holley a Pusher or puller type, makes a huge difference how and where is it mounted. in relation to the tank.
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Old 11-11-2019, 03:12 PM
79 Caballero 79 Caballero is offline
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Its mounted on the foward fender well under the hood. It worked just fine in this location before i pulled the engine a few years ago. When the engone came out, the pump did not, so nothing has changed there.
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Old 11-11-2019, 05:09 PM
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x2 electric fuel pump probly needs to be at the tank..
with a 100m filter on the suction, and a 10m on the carb...
if its been sitting dry for a while, it may be gummed up
a regular holley has vanes that are a very close slip fit, and they stick,
they do sell repair kits tho, with parts and gaskets..
.
what kind is it, link or part # ??
there's a bunch of different kinds, but most like to push rather than suck..
and they don't like to be run dry..
.
be carefull and
you can try 1 psi of air pressure on the tank, and see if it will prime, it don't take much..


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Old 11-11-2019, 06:46 PM
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Yes, be very careful with the air pressure.

You'll end up buying a new tank.

I tried to take a dent out of my dirt bike tank years ago. It went from u shaped over the frame to looking like a pair of water wings.
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Old 11-12-2019, 05:59 AM
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If you have a vacuum pump you can try to suck gas up the fuel line to the electric fuel pump then hook it back up and see what you get. other than that it sounds like you have a kinked/clogged fuel line or a cracked/leaking one.
I agree you can use air pressure in tank to prime it but as previously mentioned twice be careful as you can damage tank and seals with too much air.
Also I have typically seen electric fuel pumps mounted in or close to the fuel tank, so having it so far up in the engine bay may make the pump work harder to prime itself and keep it going, also mentioned previously.
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Old 11-12-2019, 10:06 AM
79 Caballero 79 Caballero is offline
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It may be awhile before I get back out to work on it, I've got a baby due this week, but I will likely try to move it closer to the tank. It just doesnt make sense that it worked prior to removing the gas tank. But it is what it is. In the meantime I'll just run out of a gas can for the purpose of moving in and out of the garage. Probably won't be street legal until spring anyways.
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Old 11-12-2019, 10:33 AM
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Before you relocate the pump, it would be good to read the installation instructions from Holley. If you don't have the instructions, you can get them online. Instructions will probably tell you to install the pump low and close to the tank.



Could be your pump just didn't re-prime after you worked on the fuel system. The Holley pumps I've used don't provide much suction when trying to pump fumes.


If you just get the pump working by priming it, you could have the same problem when you refill the tank after running out of gas.
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Old 11-12-2019, 07:31 PM
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Iím just taking a shot but when you say gas can, Iím sure itís well above the pump and closer to.

Push style pumps need to be flooded by the tank. They donít like to pull fuel out. If it worked before, you may have a bad line. But you should relocate it much closer to the tank.

Good luck
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Old 11-13-2019, 05:51 PM
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hope all is well with the delivery this week. congrats.
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Old 11-14-2019, 07:57 AM
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Clogged fuel sock inside the tank.
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