Vapor lock with electric fuel pump? - Suzuki Forums: Suzuki Forum Site
Suzuki Forum Suzuki Forums

» Auto Insurance
» Featured Product
Wheel & Tire Center

Go Back   Suzuki Forums: Suzuki Forum Site > Suzuki Models > Suzuki Jimny, Sierra & Samurai Forum
Register Home Forum Active Topics Photo Gallery Garage Search Today's Posts Mark Forums Read Auto EscrowAuto LoansInsurance Advertise is the premier Suzuki All Forum on the internet. Registered Users do not see the above ads.
LinkBack Thread Tools Display Modes
Old 06-05-2014, 10:16 AM   #1 (permalink)
bdrobinson21's Avatar
Join Date: Nov 2013
Location: NC
Posts: 28
Gallery: 0
bdrobinson21 is on a distinguished road
Default Vapor lock with electric fuel pump?

The previous owners of my Samurai added a mechanical fuel pump, and mounted it to the top of the engine using a valve cover bolt. I have not had any issues until last week, after about a 45 minute drive, I let the car sit for 20-30 min then it started and ran for about 200 yards, then died, and could not restart (sounded like it was out of gas) for another 30-45 minutes, then ran great. Drove for about an hour then stopped, 20 min break then it started, ran for about 100 yards, then died, and would not restart for like 3 days, once again sounding like I was out of gas. Any ideas?

Note: I have some overheating issues - thermostat gets up to almost parallel with the ground, no higher though. I also replaced the fuel filter since the issues to eliminate that possibility.
Attached Thumbnails
Vapor lock with electric fuel pump?-20140602_183043.jpg  
bdrobinson21 is offline   Reply With Quote Quick reply to this message
Sponsored Links
Old 06-05-2014, 10:41 AM   #2 (permalink)
Join Date: Mar 2009
Location: Georgetown, Guyana
Posts: 12,010
Gallery: 0
fordem will become famous soon enough

With the pump position there - vapor lock is a distinct possibility - I'd suggest it be relocated to the rear, closer to the tank maybe on a frame rail.

Vapor lock occurs when the fuel in the line on the suction side of the pump vaporizes so that the pump is "sucking" fumes rather than fuel - every thing is fine, until you switch off, the heat rises, fuel evaporates, and when you restart, the pump is unable to pull fuel, so the engine runs until what's in the carb float bowl is finished, and then dies.
98 - 1.8 Mitsubishi Pajero iO
98 - 2.0 Suzuki Grand Vitara - SQ420
05 - 2.0 Suzuki Grand Vitara - JB420
15 - 2.4 Kia Sportage
fordem is online now   Reply With Quote Quick reply to this message
Old 06-05-2014, 02:18 PM   #3 (permalink)
Join Date: Jun 2008
Location: The Kingdom of England
Posts: 5,299
Gallery: 5
Rhinoman is on a distinguished road

Most electric fuel pumps need to be mounted much lower, generally with 12" of the bottom of the tank, they are designed to push fuel and not to pull it. I would check the coolant temperature with a temperature sensor, if it is running high then flushing the system would be a good start.
Rhinoman is offline   Reply With Quote Quick reply to this message
Sponsored Links

  Suzuki Forums: Suzuki Forum Site > Suzuki Models > Suzuki Jimny, Sierra & Samurai Forum

Quick Reply

Register Now

In order to be able to post messages on the Suzuki Forums: Suzuki Forum Site forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Please select your insurance company (Optional)


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

Posting Rules
You may post new threads
You may 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
Trackbacks are On
Pingbacks are On
Refbacks are On

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 09:10 AM.

Powered by vBulletin® Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.1
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.