Login
▼
Register
Home
Help
Advertise
Login
Register
VWDiesel Blog
Facebook Group
VWD on Twitter
VWDiesel.net The IDI, TDI, and mTDI source.
»
Engine Specific Info and Questions
»
TDI Engine -General Info
(Moderators:
malone
,
burn_your_money
,
Vincent Waldon
,
theman53
) »
Losing Prime again and again....MTDI AHU
« previous
next »
Print
Pages: [
1
]
Author
Topic: Losing Prime again and again....MTDI AHU (Read 2604 times)
November 10, 2009, 10:43:24 am
avocado
Guest
Losing Prime again and again....MTDI AHU
«
on:
November 10, 2009, 10:43:24 am »
Hi
I put a AHU in a Suzuki Sidekick. Bought amanual pump from a fellow on here and the little truck runs great! Well...most of the time.
It seems to lose prime at really weird times.
I recently put a clear fuel line ( 5/16") between the fuel filter and the pump in order to see what the hell is going on. I have found that sometimes after sitting the fuel line is completely empty of fuel. I cannot figure out where the air is coming from...all lines are tight and new.
I was wondering if the fuel is just pulling out of the line (air coming from the IP side after shutdown?) and going back into the tank.
Should I put a check valve in the line at the tank to make sure fuel is only going to the engine and not back into the tank?
Logged
Reply #1
November 10, 2009, 06:46:04 pm
gldgti
Veteran
Offline
488
Re: Losing Prime again and again....MTDI AHU
«
Reply #1 on:
November 10, 2009, 06:46:04 pm »
check the injector return lines, and other return lines. when swtiched off, it will allow air in and all the fuel will drain backwards.
Logged
'77 Golf LS 4 door twincharger project
'91 Golf Cabrio 1.9TD
'94 Golf TD - AAZ, 2.5" Mandrel DP and exhaust, Merc T3 1.6TD boost pin, FMIC, Koni suspension, VR6 Brakes, VR6 Seats, VR6 sway-bars - sadly missed
'07 SKODA Octavia 1.9 TDI PD - Remapped ECU
Reply #2
November 11, 2009, 01:20:14 pm
avocado
Guest
Re: Losing Prime again and again....MTDI AHU
«
Reply #2 on:
November 11, 2009, 01:20:14 pm »
Wouldn't it be easier to just add a check valve?
The thing is that I remember having put my return line into the tank at a pretty high level, so it may be sucking air from back in the tank...
Logged
Reply #3
December 02, 2009, 11:17:24 pm
D.Loops
Newbie
Offline
7
Personal Text
[url=http://tierussianwoman.w-ru.com/]wife of a russian[/url]
Losing Prime again and again MTDI AHU
«
Reply #3 on:
December 02, 2009, 11:17:24 pm »
air in the fuel would be a problem for starting must be sucking air from somewhere or fuel could be leaking back to tank could try a non return valve?
Logged
wife of russia
Reply #4
December 03, 2009, 01:57:22 am
westyventures
User+
Offline
45
Re: Losing Prime again and again....MTDI AHU
«
Reply #4 on:
December 03, 2009, 01:57:22 am »
Check the pump shaft seal.
Logged
Karl Mullendore
www.westyventures.com
Print
Pages: [
1
]
« previous
next »
VWDiesel.net The IDI, TDI, and mTDI source.
»
Engine Specific Info and Questions
»
TDI Engine -General Info
(Moderators:
malone
,
burn_your_money
,
Vincent Waldon
,
theman53
) »
Losing Prime again and again....MTDI AHU