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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: darmentle on October 23, 2013, 03:22:25 pm
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So my 73 Chevy crawling up a steep hill starts acting like its running out of gas . So i don't think the little mechanical fuel pump on the block can keep up on a steep inclines i am running a holley 650 truck avenger. I was wanting to upgrade to a better electric one not sure on what everyone is running for a inline fuel pump. Also do i need to purchase a fuel regulator? and once i install the new inline one would i get rid of the old one on the block?
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What motor are you running?
You can upgrade mechanical pumps and not have to change hose routing.
You can use an electric inline, but I have heard they are noisy. You would probably have to use a regulator for either option, if the pressure is increased.
I'm not a genius when it comes to this, but maybe you could check into a big block (454) fuel pump. Maybe the big block pump puts out more volume.
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I just did some searching and found that Carter fuel pumps and Airtex fuel pumps for 350 and 454 are different, but they both push 40 GPH @ 1800 RPM and operate in the 7.5-9 psi range. So if your fuel pump is operating up to par and it is indeed not providing enough fuel, you can use these numbers to decide on a replacement. I have seen where Holley (I think) makes some mechanical pumps that are rated at GPH. If I remember right they make an 80 GPH pump.
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Check the float levels on the Holley.
Is that the early Truck Avenger, or is it a later unit? I heard that the earlier ones had problems.
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Its a new 383 stroker carb is the newer model runs great every where else . But when i go off road on a steep incline and i try to crawl up cause there are decent size rocks so i have to keep my foot in it so it doesn't start to sputter.
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Check the float levels. It seems that carb is pretty immune to slopes as long as the floats are adjusted properly.
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Ok cool i will check the float levels this weekend thanks.
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Yeah, you don't need a fuel pump. Maximum fuel flow is required at highway speeds with a load, like pulling a trailer at 60 mph. If you're not having trouble at speed, just rock crawling, then it's not the fuel pump.