mechanical vs electric fuel pump ?
Well, if it ain't one thing... it's 6 more with two in the wings...
out for a ride today to see if all my ignition changes made a different in the stalling situation aaaannnnd the mechanical fuel pump died a hasty death. after waiting 5 hours and going thru 3 towing co.s I got it back home... now I'm wondering if this was my problem all along starting to happen anyway got to replace it... my question mechanical or electric ?? pros/cons ?? it's a 460 carbureted with an dead eldebrock mechanical pump... changing to electric will require some major plumbing changes but if it's more reliable... it's worth it educate me on fuel delivery ??? john |
For what it is worth, my fleet uses stock mechanical. I would want to know WHY the fuel pump conked out before deciding direction because your next pump (regardless of selection) may be headed down the same path if the root cause is not determined and addressed.
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For simplicity I vote for the mechanical pump. Mine went out while at CTC a few years back. Easy fix under a big oak tree and nice Gulf breeze!! Thank goodness most all auto parts stores carry the pump I needed. Good luck Buddy. Hate I won't see you next week at CTC 2022. Steve
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Mechanical pumps have been very reliable on millions of engines for many years. I wouldn't hesitate to replace your dead Edelbrock with a stocker from your local parts house. You just have to get the right one for your application. There's a lot of choices for the 460. I just went through some of that on my 87 F250. Electric pumps have their place, but also come with their own issues to deal with, safety being one of them.
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Edelbrocks are rebuildable aren't they? Getting an over-the-partscounter fuel pump seems to be getting as questionable as rebuilt starters and alternators. I would take it apart and rebuild it.
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I don't understand the love for mechanical pumps, particularly with gasohol in the picture. I'd bet all of us on here own a modern vehicle with an electric pump that typically lasts 100K+ miles with no troubles. I've been running an Airtex electric pump for 17 years and have not had a single fuel-related problem with it. I did have a regulator diaphragm develop a leak, which was an easy and cheap fix.
With an electric pump you can (should) mount it back near the tank, away from all the heat of the engine. You also have flexibility on how you route the fuel line, away from hot components. If your tank has a return fitting, even better. There is no chance of a ruptured diaphragm filling your crankcase with fuel like with a mechanical pump. Carter and Holley both make good quality pumps. You likely want a regulator, although some electric pumps have them built in. |
All my modern DD have in tank return style electric pumps, many happy miles. 1 failure 15 years ago was $700, towing involved. 95 truck 2 fails but dual tanks so no wrecker but did involve trading in to be done with it. Both style pumps have pluses. Mechanical is easy roadside repair with a few wrenches if you have a spare. If you go electric, do it safe. Inertia switch and oil pressure trigger switch.
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I have used Holley red pumps on all my projects for decades...don't ever see a mechanical pump in my future.
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ok I went with mechanical...because it was easier than changing all the plumbing... all installed... now
how long should it take for the pump to prime and get some gas to the carb..it seems to be taking longer than I thought it would j |
You could put a slight amount of pressure in the tank to help it, just a few pounds. Or prime the carb a little.
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a stump the dummy question... hint I'm already stumped.
in regards to my fuel delivery problem... engine 460, mechanical Edlebrock 1726 mechanical pumps.. my old thinking was that mechanical pumps were gravity fed (my guru taught me this) BUT My tank outlet is 8" lower than the fuel pump inlet... so no gravity assist. do mechanical pumps have enough vacuum to pull fuel out of a lower tank ?? crude sketch shows my system rubbedr 3/8" line leaves mustang tank and turns up to frame rail... 3/8 hard line from there and it runs pretty flat along inside of rail and raises slightly to top of rail at engine SS braided line from hard line to the fuel pump don't know why this problem started now...been doing fine for over a year. I've checked all lines for blockage..filter is clean. no blockages, kinks, or bends in the lines...help the dummy will this mech pump pull fuel and if so, why did it stop https://cimg7.ibsrv.net/gimg/www.for...b25049c78b.jpg |
Originally Posted by jniolon
(Post 20584935)
My tank outlet is 8"
lower than the fuel pump inlet... so no gravity assist. do mechanical pumps have enough vacuum to pull fuel out of a lower tank ??
Originally Posted by bmoran4
(Post 20572305)
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I'll hook up a vacuum gauge on it next and pressure gauge on output . That should either show the failure in the pump or pass it as good. How much vacuum should I see ?? haven't been able to find this info anywhere... It was too late to get Edelbrock tech on the phone Friday evening...I'll try Monday am This pump is only a couple of years old and less than 1500 miles on it and I understand about quality control even on new parts...things just fail sometimes. I've had a Ford pump that had over 300K miles thru three different engines and it was still working when I sold the truck but had another OEM pump that failed out of the box too. I've got a good friend that is a guru and he is adamant that you have to have a gravity flow from the tank to the pump...to feed the pump or it will never work and I understand his thinking... but this truck has been set up this way since the start and hasn't had a problem till now... AND if it stays that way I'll never have gravity flow due to the way the hose is routed up to the frame from the tank. |
Gravity flow: I'd have to measure height from ground on my truck but 53-55 trucks have the tank between the left frame rail and the driver's running board and the top is level with the frame rail. So I'm thinking the bottom of the tank would be lower than the mechanical fuel pump.
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John, I'm not disparaging your guru but my truck is set up basically like yours and I have had no problem feeding fuel through mechanical fuel pump for 10+ years now. Of course I'm only feeding a "little" 351W and not a big honking big block!! Over the counter 1996 Bronco pump bolts right up to mine. Good luck Buddy, Steve
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