Fuel pump (gasoline pump) assembly 5 failure phenomena and solutions

Date:2023-02-07   Click:598  

The main fault phenomena of fuel pump are:
(1) cold start difficulty;
(2) Engine flameout;
(3) poor acceleration and insufficient power;
(4) assembly sound;
(5) Incorrect oil level indication.

Fuel pump assemblies for different models


(1) Cold start difficulty

1. Preliminary estimate: assembly line pressure relief


2. Specific reasons:
(1) The clamp at the pipe connection on the assembly is loose or there is a gap, leading to pressure leakage and pressure drop of the fuel system.
(2) The assembly connecting pipe is damaged, resulting in oil leakage.
(3) The tank liquid level is too low and the oil supply is insufficient.
(4) insufficient central control voltage.
(5) The rubber sleeve of the oil discharge seal is damaged due to aging, resulting in oil leakage.
(6) The nozzle parting line is in the first step, resulting in oil leakage.
(7) The slope with a larger Angle starts, resulting in insufficient oil supply due to the inclined liquid level.

(8) The check valve and safety valve in the oil pump fail, the pressure of the fuel system is insufficient, and the performance is too low.


3. Solutions:
(1) Check the connection of each pipeline and tighten the clamp;
(2) Replace the rubber tube or bellows;
(3) timely refueling;
(4) Check in-process control;
(5) Replace the rubber (changed FKM material);
(6) The parting line has given way to the first step;
(7) Avoid slope starting as much as possible;
(8) Replace the oil pump conforming to the standard.

Electronic fuel pump
(2) Engine flameout
1. Preliminary estimate: No oil supply in assembly
2. Specific reasons:
(1) oil pump relay failure;
(2) The circuit fuse is broken, and the power supply does not reach the fuel pump;
(3) The wiring harness of the fuel tank is loose, the contact is poor, and the positive and negative wires of the assembly's built-in wiring harness are broken or reversed;
(4) Excessive use of oil pump, carbon brush, commutator failure;
(5) There are foreign bodies in the oil pump, resulting in stuck.
3. Solutions:
(1) Replace the oil pump relay; (2) Replace the fuse; (3) Replace the wiring harness; (4) Replace the oil pump and thoroughly clean the oil tank; (5) Replace the oil pump and thoroughly clean the oil tank.
(3) poor acceleration and insufficient power
1. Preliminary estimate: low total oil pressure leads to insufficient oil.
2. Specific reasons:
(1) the filter resistance is too large;
(2) the filter screen is blocked;
(3) fuel system pressure regulating valve failure;
(4) There is foreign matter into the oil pump, resulting in the wear of the impeller of the pump body, making its oil absorption function decline;
(5) The performance of the oil pump is insufficient and the flow rate is too low.

3. Solutions:
(1) Replace the filter; (2) Clean or replace the screen; (3) Replace the pressure regulating valve; (4) Replace the oil pump or assembly, and thoroughly clean the tank; (5) Replace the oil pump conforming to the standard.
Magotan, New Passat 2011, CC New Santana (without valve) Fuel pump assembly
(four) assembly sound
1. Preliminary estimate: excessive noise
2. Specific reasons:
(1) Insufficient oil level, oil absorption noise. (2) the filter frame is broken.
(3) pressure regulating valve sound is too large. (4) The assembly support has clearance, vibration noise.
(5) The ejection pressure is large, the wall resistance of the flow passage is too large, and the flow passage backflow (flower scattering).
(6) The input power supply is abnormal, resulting in large or small oil pump flow, resulting in noise.
(7) The oil pump wear is too large, resulting in noise. (8) There are foreign bodies in the oil pump.

3. Solutions:
(1) Timely refueling; (2) Replace the filter screen; (3) Replace the pressure regulating valve; (4) Reassembly to reduce clearance; (5) Change the injection hole design and injection pressure; (6) Replace the oil pump relay; (7) Replace the oil pump; (8) Clean the oil tank and replace the oil pump.

(5) Incorrect oil level indication

1. Preliminary estimate: oil level sensor failure.

2. Specific reasons:
(1) Float rod deformation, failure or damage during transportation and installation.
(2) Resistance sheet, electric shock or torsion spring due to oxidation corrosion caused by poor contact.
(3) The resistance sheet is broken due to external pressure transformer such as improper transportation.
(4) Torsion spring deformation and fracture due to external forces such as improper transportation.
(5) The oil tank is too dirty, and the oil stain makes the sensor have poor contact.
(6) The float is stuck.

(7) The temperature is too high, the oil steam in the pipeline formed gas resistance; Jitter in the process of driving, the fuel pipeline produced gas resistance.


3. Solutions:
(1) Replace the float rod or oil level sensor;
(2) Wipe or replace oxidized corroded parts with erasers;
(3) Replace the resistance piece or oil level sensor;
(4) Replace the torsion spring or oil level sensor;
(5) Clean the tank;
(6) Adjust the float so that it can move freely;
(7) Cooling for a period of time, restart, if normal, then eliminate the sensor failure cause.

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