Impulse L4-2254cc 2.3L SOHC (1988)
Fuel Pressure: Testing and Inspection
Fig. 201 Checking Fuel Pressure
1.
Disconnect fuel hose between pressure regulator and fuel distributor pipe. Fuel line is still under pressure. When disconnecting fuel hose,
cover up joint with rag to prevent gasoline from spraying.
2.
Connect fuel pressure gauge across pressure regulator and fuel distributor pipe, Fig. 201.
Fig. 89 Fuel pressure specification chart.
3.
Start engine and measure fuel pressure under the four different conditions listed in chart, Fig. 89. If fuel pressure remains unchanged through
check in step 4 of chart, replace VSV.
4.
If fuel pressure does not reach specified level in step 3, proceed as follows:
a. Check fuel pressure with battery voltage applied directly to the fuel pump using jumper wires.
b. If fuel pressure does not reach specified level, check fuel pump circuit or fuel pump relay. Repair or replace as necessary. If fuel pressure
remains unchanged, check for restrictions in hose on intake side of fuel pump or defective pressure regulator on fuel pump. Repair or replace
as necessary.
5.
If fuel pressure is too high as specified in step 3, proceed as follows:
a. Check for defective pressure regulator. Replace as necessary.
b. Check for restrictions in fuel return line. Repair or replace as necessary.
c. Check for defective fuel pump. Replace as necessary.