Fuel rails getting fuel but not at pressure ALH

Ian Keeffe

Member
Joined
Feb 29, 2024
Location
Colorado
TDI
2002 golf
When I switched pumps I kept the cap out of ease. The check valve for the fuel return from the injectors was bad and sending all the fuel back to the tank. Switched the cap and I’m running great! Thanks for the input all
 

Ian Keeffe

Member
Joined
Feb 29, 2024
Location
Colorado
TDI
2002 golf
The check I did for the cap which is what I would recommend for others to test before swapping pumps is clamping the black return line and opening the injectors. If they spray with that then it’s the check valve in the cap
 

KLXD

Top Post Dawg
Joined
Aug 22, 2009
Location
Lompoc, CA
TDI
'98, '2 Jettas
"Okay so now there’s conflicting info. If I opened it two whole turns, should it spray up more than one inch?"

If there's conflict between what I and Oil say, certainly go by his experience.
 
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Ian Keeffe

Member
Joined
Feb 29, 2024
Location
Colorado
TDI
2002 golf
Yea he was right. It just took the new cap and I was getting large amounts of spray no matter how loose it was
 

T1MMBOJONES

Veteran Member
Joined
Nov 10, 2020
Location
Milwaukee
TDI
03 ALH 01M wagon
not to hijack this but do you happen to know what psi the CJAA aux pump puts out OH? sorry if this is easily obtainable info but i kinda forgot i have mine in a box doing nothing.....
 

jmodge

Top Post Dawg
Joined
Jun 18, 2015
Location
Greenville, MI
TDI
2001 alh Jetta, RC2 w/.205's 5speed daily summer commuter and 2000 alh Jetta 5spd swap, 2" lift, hitch, stage 3 TDtuning w/.216's winter cruiser, 1996 Tacoma ALh
Yea he was right. It just took the new cap and I was getting large amounts of spray no matter how loose it was
Good piece of troubleshooting there
 
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