Lotus Elan

Electric Fuel Pump noisy at idle

PostPost by: ftsoft » Thu Apr 22, 2010 8:49 pm

I just completed an engine rebuild which included fitting an electric fuel pump. It works well and the car runs well, but the pump is really noisy at idle and situations were there isn't much gas being drawn. I can't here the noise at running speeds, even at low speeds. I can turn the pump off at red lights and the engine continues to run (i don't know how long it would run). Also the car starts right up cold as usual, but sometimes after running for a while if the car sits for a half hour it doesn't start right up. The noise is a real banging as opposed to the fairly reasonable noise of the pump running normally. I have a pressure valve and it's set to 2.0. Thanks.

Frank
66 S2 26/5194
LP4711LA-B
User avatar
ftsoft
Second Gear
Second Gear
 
Posts: 184
Joined: 15 Sep 2009
Location: Ohio, USA

PostPost by: prezoom » Fri Apr 23, 2010 4:28 pm

Frank,

If the pump is not mounted on soft rubber mounts, the body acts like a wonderful drum shell. Used rubber mounts and now I can only hear the pump when the engine is off and I am waiting for the pump to fill the carbs.

Rob Walker
26-4889
Rob Walker
26-4889
50-0315N
1964 Sabra GT
1964 Elva Mk4T Coupe (awaiting restoration)
1965 Ford Falcon Ranchero, 302,AOD,9",rack and pinion,disc,etc,etc,etc
1954 Nash Healey LeMans Coupe

Owning a Lotus will get you off the couch
prezoom
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 1257
Joined: 16 Mar 2009
Location: Escondido, California

PostPost by: ftsoft » Fri Apr 23, 2010 9:21 pm

Rob

Thanks. I was wondering if rubber mounts might help.

Frank
66 S2 26/5194
LP4711LA-B
User avatar
ftsoft
Second Gear
Second Gear
 
Posts: 184
Joined: 15 Sep 2009
Location: Ohio, USA

PostPost by: stugilmour » Sat Apr 24, 2010 1:09 am

Rob:

Where did you mount your electric pump? The PO mounted mine directly to the frame at the rear. Found it pretty loud as well. Just looking at re-mounting it as body will be re-installed shortly. Any good ideas for location appreciated.
Stu
1969 Plus 2 Federal LHD
User avatar
stugilmour
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 1751
Joined: 03 Sep 2007
Location: Calgary Alberta Canada

PostPost by: paddy » Sat Apr 24, 2010 9:52 am

Mine is mounted at the front of the boot well, at the lowest point. It is mounted on rubber bushes (the small Mini exhaust bobbin bushes). You can hear it before starting the engine but not at idle.

You can also hear it as soon as you start to run out of fuel, in which case you know you have about a mile to get some more :)

Paddy
1963 Elan S1
User avatar
paddy
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 1191
Joined: 27 Oct 2008
Location: Woking, Surrey

PostPost by: 69S4 » Sat Apr 24, 2010 11:17 am

Mine is at the front of the small gap to the right of the fuel tank (looking from the back of the car) so the bolts go through to the wheel arch. It's not rubber mounted and not noisy; I can hear it clicking away when the engine is off and just about sometimes at idle - about 2- 3 clicks/sec. Like Paddy, when it gets to be continuous you're getting close to walking.
Stuart Holding
Thame UK / Alpe D'Huez France
69 S4 FHC
Honda GoldWing 1800
Honda CBX1000
Kawasaki H1 500
Yamaha XS2
69S4
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 1210
Joined: 23 Sep 2004
Location: nr Oxford UK

PostPost by: GrUmPyBoDgEr » Sat Apr 24, 2010 11:45 am

Here's where I fitted my S4's Fuel Pump & Pressure Regulator.
The Pump was supplied with Rubber Mounts & like others have mentioned the Pump can be heard ticking away prior to start up.
After that all the other Noise drowns it out.

Cheers
John
Attachments
Boot1.jpg and
Boot3.jpg and
Boot2.jpg and
Beware of the Illuminati


Editor: On Sunday morning, February 8th 2015, Derek "John" Pelly AKA GrumpyBodger passed away genuinely peacefully at Weston Hospicecare, Weston Super Mare. He will be missed.
User avatar
GrUmPyBoDgEr
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 3151
Joined: 29 Oct 2004
Location: Burnham-on-Mud

PostPost by: ftsoft » Sat Apr 24, 2010 12:50 pm

Here is mine. Any recommendations for rubber bushings?
Attachments
DSCN1312.jpg and
66 S2 26/5194
LP4711LA-B
User avatar
ftsoft
Second Gear
Second Gear
 
Posts: 184
Joined: 15 Sep 2009
Location: Ohio, USA

PostPost by: stugilmour » Sat Apr 24, 2010 2:14 pm

Thanks for the suggestions & photo's. Very helpful.
Stu
1969 Plus 2 Federal LHD
User avatar
stugilmour
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 1751
Joined: 03 Sep 2007
Location: Calgary Alberta Canada

PostPost by: billwill » Sat Apr 24, 2010 2:47 pm

Has anyone fitted an inertia switch to turn off the pump if you have a crash?
Bill Williams

36/6725 S3 Coupe OGU108E Yellow over Black.
billwill
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 4721
Joined: 19 Apr 2008
Location: London UK

PostPost by: prezoom » Sat Apr 24, 2010 7:08 pm

The rubber vibration isolation mounts I used are similar to these from MSC Industrial Supply, here in the colonies. 1-800-645-7270 or www.mscdirect.com

Part number 62187331 M8x1.25
63661524 M6x1.0

The mounts have a threaded stud on each side. The stud is long enough to go through the fiberglass into the wheelwell, or whatever. Can trim to suit.

Rob Walker
26-4889
Rob Walker
26-4889
50-0315N
1964 Sabra GT
1964 Elva Mk4T Coupe (awaiting restoration)
1965 Ford Falcon Ranchero, 302,AOD,9",rack and pinion,disc,etc,etc,etc
1954 Nash Healey LeMans Coupe

Owning a Lotus will get you off the couch
prezoom
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 1257
Joined: 16 Mar 2009
Location: Escondido, California

PostPost by: 69S4 » Sun Apr 25, 2010 6:28 am

billwill wrote:Has anyone fitted an inertia switch to turn off the pump if you have a crash?


It's been on my "to do" list to wire the pump through an oil pressure sensor - no oil pressure, pump switches off, with an over-switch for filling the carbs after a rebuild etc. I really need to source the bits and do it
Stuart Holding
Thame UK / Alpe D'Huez France
69 S4 FHC
Honda GoldWing 1800
Honda CBX1000
Kawasaki H1 500
Yamaha XS2
69S4
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 1210
Joined: 23 Sep 2004
Location: nr Oxford UK

PostPost by: billwill » Mon Apr 26, 2010 3:57 am

69S4 wrote:
billwill wrote:Has anyone fitted an inertia switch to turn off the pump if you have a crash?


It's been on my "to do" list to wire the pump through an oil pressure sensor - no oil pressure, pump switches off, with an over-switch for filling the carbs after a rebuild etc. I really need to source the bits and do it



That does tend to assume the engine stops after a crash. Better than nothing though I suppose.
The oil warning light switch works the wrong way of course. Are there any oil pressure switches with change-over contact



You will need to override every-time you want to start the engine? I suggest a push button start the pump to prime the carbs
Bill Williams

36/6725 S3 Coupe OGU108E Yellow over Black.
billwill
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 4721
Joined: 19 Apr 2008
Location: London UK

PostPost by: Steve G » Mon Apr 26, 2010 12:05 pm

Mine is mounted on the upper section of the boot floor on rubber mounts and can only be heard when you turn the ignition before the engine catches. It is a very quiet whirring sound. I will post pictures up of the installation.
User avatar
Steve G
Third Gear
Third Gear
 
Posts: 314
Joined: 17 Aug 2009
Location: Brighton, UK

PostPost by: robertverhey » Mon Apr 26, 2010 12:30 pm

That does tend to assume the engine stops after a crash. Better than nothing though I suppose.
The oil warning light switch works the wrong way of course. Are there any oil pressure switches with change-over contact


You'd need to run it through a switching relay. Slightly more complex, but do-able. Anybody good a sketching a basic circuit diagram? If not I'll have a go....

Robert
robertverhey
Fourth Gear
Fourth Gear
 
Posts: 781
Joined: 20 Feb 2007
Location: Sydney Australia
Next

Total Online:

Users browsing this forum: Flatcap and 6 guests