Fuel pump pulse - HobbyTalk
  
HobbyTalk Forum for Diecast Collectors, Modelers, Slot Cars, & Radio Control
Home Forums Photo Album RC TrackFinder Catalog Donation/HobbyTalk Supporter

Welcome to the HobbyTalk forums.

You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, view attachments, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please contact contact us. Forgotten your password? Click here!

NOTE: Once you register and are logged in this welcome section will no longer be visible.

Go Back   HobbyTalk > Small Engine Repair > Small Engine Repair 4-Cycle
Register Classifieds Help/TOS Members List Calendar Mark Forums Read

Reply
 
Thread Tools
  #1  
Old 06-20-2009, 07:56 AM
RKDOC RKDOC is offline
Elder Statesman

My Photos
 
Join Date: Jun 2006
Posts: 629
Fuel pump pulse

I am working on a B&S Model 42E707 Type 2631-E1 Code 9809025B. My question is, is there any way to check the pulse on the fuel pump. The engine will start with gas poured into the carb but will not keep running. The line is clear from the pump to the tank. I have ordered a kit for the pump, I was just wondering if there is pulse from the engine to operate he pump? I have removed the pulse line at the pump and can blow through the line into the engine.

Thanks for your help and advise.
Reply With Quote
  #2  
Old 06-20-2009, 04:06 PM
30yearTech's Avatar
30yearTech 30yearTech is offline
HobbyTalk Supporter

My Photos
 
Join Date: Sep 2006
Location: Central Texas
Posts: 5,705
Unless there is a major leak in the crankcase, you pretty much will always have a pulse from the engine. You could put a little oil in the pulse hose and crank the engine over, if there is any oil ejected from the hose, that would indicate pressure from the crankcase.

The easiest way to tell if the fuel pump is working is to crank over the engine with the fuel hose disconnected from the carburetor and see if fuel is pumped out.
Reply With Quote
  #3  
Old 06-20-2009, 07:11 PM
RKDOC RKDOC is offline
Elder Statesman

My Photos
 
Join Date: Jun 2006
Posts: 629
Thanks for the reply 30 year. Usualy I do unhook the fuel line to see if fuel comes out, however on this engine the pump is part of the carb, no hose running to the carb.

I checked the carb out a little closer and think I fund the passage where the fuel gets in to the carb. Next time I will know where to check it.

Thanks for the help.
Reply With Quote
  #4  
Old 06-21-2009, 11:33 AM
30yearTech's Avatar
30yearTech 30yearTech is offline
HobbyTalk Supporter

My Photos
 
Join Date: Sep 2006
Location: Central Texas
Posts: 5,705
I did not pay attention to the model number when I posted (my bad), To check this type of set up, I usually just take the top off of the carburetor and crank the engine. If the fuel pump is working, fuel will shoot out the port about two or three inches. You don't need to crank very long to find out if it's working. I usually pack a shop towel around the carburetor to catch the fuel, you will know in short order if it's working or not.
Reply With Quote
  #5  
Old 07-01-2009, 11:08 PM
RKDOC RKDOC is offline
Elder Statesman

My Photos
 
Join Date: Jun 2006
Posts: 629
I am still having issues with this engine carburetor. I installed a new fuel pump kit. Cleanesd all the passages. Still it will not pump fuel to the carb. I can blow through the fuel line, I even tried sucking the fuel to the carb, its there. When cranking the engine I can feel pulse from the pulse line, but no suction from the pump. I have checked the pump center piece for cracks but can see none.

Any suggestions what I might check next would be greatly appreciated. I am realy frustrated with this carb. I have to buy a new carb just to replace the fuel pump.

Thanks for the help.
Reply With Quote
  #6  
Old 07-02-2009, 08:00 PM
30yearTech's Avatar
30yearTech 30yearTech is offline
HobbyTalk Supporter

My Photos
 
Join Date: Sep 2006
Location: Central Texas
Posts: 5,705
Have you tried cranking over the engine with the top half of the carburetor off?

If not, the problem could lie in the passage way to the fuel inlet where the float needle seats.
Reply With Quote
  #7  
Old 07-02-2009, 11:26 PM
RKDOC RKDOC is offline
Elder Statesman

My Photos
 
Join Date: Jun 2006
Posts: 629
Thanks for the reply 30 year. I found the problem, apparently the fuel line was bad. I replaced the line and the problem was solved.

Now for the question, the fuel line looked good, the clamps were tight. So how would a person determine if it was the pump or the fuel line? or when you have a pump issue do you change the fuel line before condemning the pump?

Any thoughts on what I could have done quicker to have saved several days of frustration. Thanks for all the help.
Reply With Quote
  #8  
Old 07-02-2009, 11:46 PM
30yearTech's Avatar
30yearTech 30yearTech is offline
HobbyTalk Supporter

My Photos
 
Join Date: Sep 2006
Location: Central Texas
Posts: 5,705
Well I can honestly say that I have never run across this issue before. I have had bad fuel line, that was visibly cracking and leaking, but the fuel was still flowing through to the carburetor. Just something you have to keep in mind if you ever run across this again.
Reply With Quote
  #9  
Old 07-03-2009, 10:37 AM
RKDOC RKDOC is offline
Elder Statesman

My Photos
 
Join Date: Jun 2006
Posts: 629
Thanks 30 year. Chalk it up to another lesson learned.
Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


Featured Sponsor

You Can Sponsor
A HobbyTalk Forum


HobbyTalk® Sponsors
Diecast
CScollectibles
Collectables Corner
DieCast Alley
Global Diecast Direct
Milezone
Mini-Motors Inc
Scoomer
The Toy Peddler
Toy Car Aution
Models
MegaHobby
Modeler’s Brand
ParaGrafix Modeling Systems
Radio Control
BeachRC.com
B-Fast RC
Dirt Cheap RC
Discount RC Tires
Irrgang Racing Service
Lefthander RC
MaxAmps.com
RCTV Live
SMC Racing
Speedzone
Thunder Racing
Tekin
Trend Times
TQ Racing
Windtunnel Racing
Slot Cars
AFX Racing
Scoomer
Slot Magazine
Sponsored Events

Become a
HobbyTalk® Supporter

Advertise on HobbyTalk®



Powered by vBulletin®
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
All times are GMT -4. The time now is 02:17 AM.
HobbyTalk® is a Registered Trademark of HobbyTalk Ltd.
All other logos and trademarks on this site are property of their respective owner.
Copyright (c) 1997-2012 HobbyTalk Ltd. No use without permission.
Advertising positioning by Digital Point