Fuel Tank - Transfer Solenoid Operation

Number: J80/006

Date: January, 1980

Subject: Fuel Tank Change-Over Solenoids

Models: All Series III

This bulletin outlines the function of the fuel solenoids and will help to establish the cause of the fuel transference from side to side. (Refer to training aid 51049).

Fuel tank contamination is a common cause for the solenoid/transfer valves sticking. Drain tanks to ensure no contamination is present.





Solenoid Valve Operation





Fuel Transfer Diagnostic Chart

Section A
Fault With Delivery Line

(i) Tank change over valve (C44918) stuck partially open.

(ii) Dirt on R.H. valve seat.

(iii) Pick up filter (C29445) in L.H. tank partially blocked. This may be accompanied by excessive fuel pump noise.

Section B
Fault With Recirculation Line

(i) R.H. recirculation valve (CAC2460) stuck open.

(ii) Dirt on seat of R.H. valve.

(iii L.H. recirculation valve (CAC2461) stuck closed.

Section C
Heat Soak Condition

During heat soak conditions fuel expansion expels approximately 2OOcc of fuel into the L.H. tank. Hence, with the L.H. tank full, if the car is driven continuously on the R.H. tank after approximately 25-30 stops of over 15 minutes duration the L.H. tank will become completely full.


Section D
Fault With The Recirculation Line

(i) No feed to L. H. recirculation valve (CAC 2461).

(ii) L.H. recirculation valve coil open circuit or high resistance.

(iii) L.H. recirculation valve stuck open or dirt on seal face.

(iv) R.H. recirculation valve (CAC 2460) stuck closed or restricted flow.

(v) No feed to R.H. recirculation valve.

(vi) R.H. recirculation valve coil open circuit or high resistance.

Section E
Fault With Suction Line


(i) Faulty ground to tank change over valve.

(ii) Tank change over valve open circuit or high resistance.

(iii) Tank change over valve partially open or dirt on L.H. valve seat.

(iv) Pick up filter (C29445) in R.H. tank partially blocked. This may be accompanied by excessive fuel pump noise.