E-Pump Not keeping up
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Cargo Master
Joined: Oct 2012
Posts: 3,072
Likes: 48
From: California
E-Pump Not keeping up
Anyone else have problems with the fuel flow with their duralift e-pumps? I've changed mine out three times while trying to figure out why my fuel pressure dips to 0 psi (at the IP) while driving up long steep California grades. I've tried different pressure (7-9, 11-15, etc) e-pumps and they all reacted the same up big mountain hills, but all of them had the same 33 GPH flow rate. I'm thinking that I might have a kinked fuel line that is restricting flow, or the e-pump isn't pushing enough fuel. Any ideas?
How can I test for low-flow? When I push the schrader valve in park, I get plenty of fuel. This seems to only occur when I'm powering up a big hill. I'd expect a fuel line kink would result in low flow at the schrader valve too.
How can I test for low-flow? When I push the schrader valve in park, I get plenty of fuel. This seems to only occur when I'm powering up a big hill. I'd expect a fuel line kink would result in low flow at the schrader valve too.
Laughing Gas
Joined: Dec 2013
Posts: 884
Likes: 7
I just don't think they flow enough to keep up with full demand. My truck's fuel filter light will flicker if I have it floored a while, which means the IP is actually pulling vacuum on the Facet.
I had another truck I put a 7.3 Super Duty frame rail pump on with a bypass regulator and it actually kept up. The SD pump should have lasted forever since it never had to build 60 psi or whatever the Powerstroke requires. I noticed significant power loss after switching to the duralift.
I had another truck I put a 7.3 Super Duty frame rail pump on with a bypass regulator and it actually kept up. The SD pump should have lasted forever since it never had to build 60 psi or whatever the Powerstroke requires. I noticed significant power loss after switching to the duralift.
Logistics Pro
Joined: Jun 2017
Posts: 3,980
Likes: 515
From: Edmond, OK
That's surprising that you guys have had trouble with the Duralift pumps. Before going back to a mechanical lift pump have you tried going to an oversized fuel supply line? Doesn't R&D make a kit to do this? 
Laughing Gas
Joined: Dec 2013
Posts: 884
Likes: 7
Could upgrade the lines throughout would help flow some. But with a bypass system and large enough pump, all the restrictions are accounted for.
I just accepted the loss in performance for reliability, the duralift is a great pump. When I spend some money on a more expensive reliable performance pump and a bypass valve I can have both.
90+% of the time the Facet flows more than enough.
I just accepted the loss in performance for reliability, the duralift is a great pump. When I spend some money on a more expensive reliable performance pump and a bypass valve I can have both.
90+% of the time the Facet flows more than enough.
Senior User
Joined: Jun 2013
Posts: 170
Likes: 4
I had a similar fuel supply problem. Thought the fuel filter was clogged. Changed it and it helped briefly. Tried swapping fuel pumps in/out, Holley Red and Carter P4070. Neither of them made a difference. Ordered the Carter P4600HP, it helped, but the problem persisted.It was the tank selector valve. It had just enough restriction to cause issues. Bypassed it and only run 1 tank. Problem solved.
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Scope Wizard
Joined: May 2019
Posts: 6,530
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I had a similar fuel supply problem. Thought the fuel filter was clogged. Changed it and it helped briefly. Tried swapping fuel pumps in/out, Holley Red and Carter P4070. Neither of them made a difference. Ordered the Carter P4600HP, it helped, but the problem persisted.It was the tank selector valve. It had just enough restriction to cause issues. Bypassed it and only run 1 tank. Problem solved.
I don't use E-Pumps, I just run the old Carter rebuildable mechanical so I don't have much input on his problem.
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I never tried the facet, but I tried a few cheaper one and to me they never flowed enough.
The problem is idi's have a high return volume for pump cooling so you need a pump with high volume yet low pressure. Mechanical pumps do exactly this.
I'd vote for a better pump and a really good regulated return setup if you wanted to stay electric. If your regulator doesn't have its own return line don't buy it as they're junk. Over time the diaphragms can fail as well so make sure if you buy one that that offer replacement parts.
The problem is idi's have a high return volume for pump cooling so you need a pump with high volume yet low pressure. Mechanical pumps do exactly this.
I'd vote for a better pump and a really good regulated return setup if you wanted to stay electric. If your regulator doesn't have its own return line don't buy it as they're junk. Over time the diaphragms can fail as well so make sure if you buy one that that offer replacement parts.
Fleet Owner
Joined: Jul 2006
Posts: 20,382
Likes: 845
From: Mi'kma'ki
No problems with either of them on my trucks either. I hear about this from time to time. I think the guys have a good suggestion. Bypass the tank selector valve just temporarily and see what happens.
i ain't rite
Joined: Mar 2005
Posts: 65,573
Likes: 5,609
From: Marlboro Mental Hospital.
the facet pump is diesel rated to lift fuel 10 foot straight up. hence the name "duralift"
they were designed for use on refrigerated trailers where the fuel tank was under the box and the engine was up top.
i have seen quite a few with over 30 years service and still going strong.
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