FASS spring replacement

Reply Subscribe

Thread Tools

Search this Thread

12-22-2008, 12:19 AM

DUKCALN

Registered User

Thread Starter

Join Date: Mar 2008

Posts: 548

Likes: 0

Received 0 Likes on 0 Posts

FASS spring replacement

Somebody please step me through the spring replacement. Adding a spring for more psi.

Reply Like

12-22-2008, 12:40 AM

dieselram_04

Registered User

Join Date: Oct 2004

Location: Southern IL

Posts: 280

Likes: 0

Received 0 Likes on 0 Posts

not sure about the fass but on the airdog you pull the fitting out of the return port on pump and spring is behind that.

Reply Like

12-22-2008, 06:03 AM

homewrecker

Registered User

Join Date: Nov 2006

Location: N.C.

Posts: 1,628

Likes: 0

Received 1 Like on 1 Post

Dieselram is right.Remove the return fitting off the pump and its behind there.Becareful and don't drop the rubber ball that goes behind the spring.Its very simple.The spring seats the ball against the return port.If the pressure is higher than the springs rating it pushes the ball away and allows excess pressure to bleed back to the tank,when you need all the fuel flow to maintain pressure the ball blocks the return port.