Fuel Nozzle Problems and Solutions

The fuel nozzle is the terminal equipment of the hydraulic system of the fuel dispenser, and it is a tool for injecting oil into the fuel dispenser of the vehicle.

The fuel nozzle requires an easy operation, an adjustable oil supply, and safe and reliable use.

Due to the long use time and frequent use, some fuel nozzles will have the phenomenon of less flow, no oil, no self-sealing, and oil leakage.

diesel station

What problems will the fuel nozzle have after using it for a long time?

1. The fuel nozzle is frequently self-styled

2. The small flow of the fuel nozzle is not self-styled

3. The fuel nozzle is not self-styled

4. Oil leaks after the fuel nozzle are turned off

5. The fuel nozzle leaks oil

6. The fuel nozzle does not produce oil or the flow is small

 

fuel nozzle

What is the solution?

1. The reason why the fuel nozzle is frequently self-styled.

1.1 Whether the self-sealing hole is blocked by debris. The sundries block the self-sealing or enter its pipeline, which will directly lead to the frequent occurrence of self-sealing.

Solution: You can remove the barrel, blow the self-sealing pipeline with the pressure air flow, and blow the debris out, the nozzle can be restored to normal, clean the barrel of the refueling nozzle frequently, and clean the dirt of the fuel tank port of the car before refueling, which can effectively prevent self-styled frequent failures.

1.2 The fuel nozzle itself causes frequent self-closing.

Take an open metal container, add oil to the container, and add oil at different gears and flow rates to ensure that the self-sealing hole does not contact oil and oil bubbles, and determine whether it is self-sealing for no reason.

Repeatedly switch the refueling nozzle, or immerse the muzzle of the nozzle in oil to make it self-sealing normally. Repeat the operation 20 times. If there is a phenomenon of self-sealing for no reason during the refueling process, it can be judged that the fuel nozzle is abnormal.

fuel nozzle detail drawing

2. The reason for the small flow of the fuel nozzle is not self-professing

The elastic force of the upper chamber spring of the switch membrane of the fuel nozzle self-sealing mechanism is too large. In the case of small flow, the flow rate is low, the air suction effect is weak, and the pressure difference between the upper and lower chambers of the switch membrane is small, which cannot overcome the elastic force of the spring to move the self-sealing rod upward.

Solution: reduce the elastic force of the upper chamber spring of the switch membrane.

3. The reason why the fuel nozzle is not self-styled

3.1 The upper cavity plastic cap wire is not tightened.

Solution: Tighten the plastic cover by pressing wire.

3.2 The “O” type sealing ring on the fuel nozzle adapter sleeve and the auxiliary valve seat is damaged, so that the pressure difference cannot be formed between the upper and lower chambers of the switch membrane.

Solution: Replace the damaged “O” ring.

3.3 The air hole on the fuel nozzle adapter sleeve is blocked.

3.4 The spring force of the upper cavity of the self-sealing mechanism switch diaphragm is too large.

4. Reasons for oil leakage after the fuel nozzle is turned off.

4.1 There are foreign objects in the main valve and the auxiliary valve, which cause the main valve and the auxiliary valve to not seal tightly.

4.2 The auxiliary valve spring fails and does not have a sealing effect.

Solution: Clean the main valve, and auxiliary valve, lengthen the auxiliary valve spring or replace the auxiliary valve spring.

5. Reasons for oil leakage from the fuel nozzle

5.1 Oil leaks at the ejector rod;

The reason is that the seal at the ejector rod fails and the barrel seal is damaged.

Inspection method: Remove the barrel and check the seal.

Solution: Replace the O-ring.

5.2 Oil leaks at the mouth of the nozzle;

The reason is the loss of sealant at the barrel and valve seat.

Inspection method: Check whether the barrel is loose.

Solution: Replace the barrel.

5.3 The oil leakage of the top cover is mainly manifested as the main valve cover is combined with oil leakage.

The reason is that the sealing ring is damaged.

Inspection method: Open the main valve cover on the top of the nozzle body and check the sealing ring.

Solution: Replace the O-ring.

5.4 The oil leakage of the nozzle body is mainly manifested as the oil leakage of the casting.

The reason may be

(1) defects such as sand holes in the nozzle body casting itself.

Solution: replace the fuel nozzle.

(2) The nozzle body is damaged.

Solution: Replace the fuel nozzle.

5.5 Oil leaks at the oil inlet.

Solution: Replace the fuel nozzle.

 

Fuel Dispenser nozzle

6. The fuel nozzle does not produce oil or the flow is small

6.1 The filter of the fuel nozzle is blocked and needs to be cleaned. This is a link that people tend to ignore.

The oil dispenser is slow, and some people have repaired it for a long time, but they have not repaired it.

The reason is that the filter is blocked here.

6.2 The oil pipe joint is blocked by foreign objects, which is also a link that people tend to ignore.

Some hoses are aging, and the internal rubber block falls off. At the movable joint, it is relatively thin and just stuck, which affects the normal oil output of the fuel nozzle.

A fuel dispenser can complete the refueling work without the fuel nozzle, and the fuel nozzle is a wearing part.

Therefore, when using it, you should pay attention to daily maintenance and handle it with care, and it is strictly forbidden to beat it.

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