DA40 Fuel Pump Operation

Open for questions of visitors of DAN. Posts of our guests are on moderation queue.

Moderators: Rick, Lance Murray

DiamondMike1

DA40 Fuel Pump Operation

Postby DiamondMike1 » Sat Mar 10, 2018 12:32 pm

For those flying the DA40, the POH specifies turning the electric fuel pump on before doing the run up.

It seems to me that it would be prudent to do the run up with the electric fuel pump off to determine whether the engine runs satisfactorily on the engine driven pump alone. The electric pump could then be turned on during the before takeoff checklist.

Does anyone here do the run up with the electric fuel pump off?

Thanks.
User avatar
Rick
5 Diamonds Member
5 Diamonds Member
FIRST NAME: Rick
Aircraft: DA40
Registration: N171PS
Airport: KROA

Posts: 1197
Joined: Tue Jul 06, 2010 10:09 pm
Has thanked: 70 times
Been thanked: 104 times

Re: DA40 Fuel Pump Operation

Postby Rick » Sat Mar 10, 2018 4:22 pm

I've never done a run up with the electric fuel pump on in a DA40. Ever. I completely agree with your reasoning. My wife is also taking lessons in our DA40, and has never been told to use the fuel pump during the run up.
2007 DA40 XL - Roanoke, VA (KROA)
User avatar
Steve
5 Diamonds Member
5 Diamonds Member
FIRST NAME: Steve
Aircraft: DA40
Registration: N432SC
Airport: K1T7

Posts: 736
Joined: Thu Aug 12, 2010 1:23 am
Has thanked: 11 times
Been thanked: 69 times

Re: DA40 Fuel Pump Operation

Postby Steve » Sat Mar 10, 2018 4:30 pm

Same here - never do the runup with the electric pump on (my checklist doesn't say to). I try to use the electric pump as little as possible. I just use it on takeoff to 1000' AGL, and in the pattern to land. I still have my original electric pump after 17 years (hope I didn't jinx myself).

Steve
User avatar
Don
3 Diamonds Member
3 Diamonds Member
FIRST NAME: Don
Aircraft: DA40
Registration: N623DS
Airport: KTOA

Posts: 178
Joined: Tue Jul 06, 2010 9:15 pm
Has thanked: 19 times
Been thanked: 23 times

Re: DA40 Fuel Pump Operation

Postby Don » Sat Mar 10, 2018 7:04 pm

I agree with the same logic as others here. I never do the run up with the pump on. After my 2000 RPM mag check, I also bring the throttle back to full idle for a moment to make sure the engine does not stall out at very low RPM.
Diamond Star XLS, N623DS, SN40.1076
User avatar
Rich
5 Diamonds Member
5 Diamonds Member
FIRST NAME: Rich
Aircraft: DA40
Registration: N40XE
Airport: S39

Posts: 1324
Joined: Mon Aug 30, 2010 12:40 pm
Has thanked: 15 times
Been thanked: 113 times

Re: DA40 Fuel Pump Operation

Postby Rich » Sat Mar 10, 2018 7:31 pm

For a couple of the below obvious reasons, it's actually counterproductive to have the electric pump on during run up. I do make sure it's running on takeoff, however. A power loss right at takeoff can be lethal: Witness the recent SR22 fatal crash at Montgomery field (San Diego). It may or may not have been a fuel pump problem, but it seems clear it was a power loss (in an almost-new airplane) right at the worst possible time that was the triggering event.
User avatar
gordsh
3 Diamonds Member
3 Diamonds Member
FIRST NAME: Shawn
Aircraft: DA40
Registration: CGTLG
Airport: CZBA

Posts: 121
Joined: Wed Jun 21, 2017 4:40 pm
Has thanked: 52 times
Been thanked: 17 times

Re: DA40 Fuel Pump Operation

Postby gordsh » Sat Mar 10, 2018 8:56 pm

During my checklist execution the fuel pump is turned OFF after the engine starts (for a normal start). The fuel pump stays OFF during [Taxi] & [RunUp] portion of the checklist and then is turned ON in the [Before Takeoff] portion of the checklist.
GTLG | DA40 XLS Premier Ed.| 40.1083
CZBA | Burlington | Ontario | CANADA
User avatar
ThomasD
3 Diamonds Member
3 Diamonds Member
FIRST NAME: ThomasD
Aircraft: DA40
Registration: N215DS
Airport: EGGD

Posts: 151
Joined: Thu Jan 20, 2011 9:53 pm
Has thanked: 1 time
Been thanked: 9 times

Re: DA40 Fuel Pump Operation

Postby ThomasD » Sun Mar 11, 2018 12:19 pm

I agree with Gordsh and others - I do the same. (Plus pump on at final approach as well.)

FYI one thing that I do not do [which is recommended in the POH] is to switch on the fuel pump when changing tanks in flight, if I am 3,000' or above.
I have never had a hiccup of the engine when just switching in-flight left-right or vice-versa without the pump on, so I don't do so (as the pump appears to have a quite limited life).
User avatar
CFIDave
5 Diamonds Member
5 Diamonds Member
FIRST NAME: Dave
Aircraft: DA62
Registration: N62DV
Airport: KJYO

Posts: 1360
Joined: Wed Nov 07, 2012 3:40 pm
Has thanked: 55 times
Been thanked: 245 times

Re: DA40 Fuel Pump Operation

Postby CFIDave » Sun Mar 11, 2018 2:33 pm

Just to add to the responses above (which I agree with), the original Dukes electric fuel pumps installed in DA40s before around 2009 typically failed every 300-400 hours, so pilots learned to turn on the pump as little as possible. The Weldon electric fuel pumps on newer DA40s have proven to be more robust.
N62DV DA62 62.056
N42DA DA42-VI 42.N117 (sold)
N811ET DA40 XLS 40.874 (sold)
KJYO Leesburg, Virginia
User avatar
gordsh
3 Diamonds Member
3 Diamonds Member
FIRST NAME: Shawn
Aircraft: DA40
Registration: CGTLG
Airport: CZBA

Posts: 121
Joined: Wed Jun 21, 2017 4:40 pm
Has thanked: 52 times
Been thanked: 17 times

Re: DA40 Fuel Pump Operation

Postby gordsh » Sun Mar 11, 2018 3:39 pm

Another thing I should mention is that when practicing circuits I leave the pump ON all the time...as long as I am just doing [takeoff] - [downwind] - [base] - [final] - [landing]....over and over again.

What do you think about that scenario? I just found it too much for me to turn the pump [OFF] once I start [downwind] and then turn it back ON during [base to final]. Similarly when doing circuits I leave the prop full forward.
GTLG | DA40 XLS Premier Ed.| 40.1083
CZBA | Burlington | Ontario | CANADA
User avatar
CFIDave
5 Diamonds Member
5 Diamonds Member
FIRST NAME: Dave
Aircraft: DA62
Registration: N62DV
Airport: KJYO

Posts: 1360
Joined: Wed Nov 07, 2012 3:40 pm
Has thanked: 55 times
Been thanked: 245 times

Re: DA40 Fuel Pump Operation

Postby CFIDave » Sun Mar 11, 2018 3:50 pm

gordsh wrote:I just found it too much for me to turn the pump [OFF] once I start [downwind] and then turn it back ON during [base to final]. Similarly when doing circuits I leave the prop full forward.
By doing this you're cheating yourself out of learning the "muscle memory" cockpit flows experienced when flying in the pattern/circuits. You need to cycle the electric fuel pump and prop control (red knob) after/before takeoffs and landings so that their operation becomes ingrained in your memory for ALL takeoffs and landings.
N62DV DA62 62.056
N42DA DA42-VI 42.N117 (sold)
N811ET DA40 XLS 40.874 (sold)
KJYO Leesburg, Virginia

Who is online

Users browsing this forum: No registered users and 0 guests