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FUEL INJECTION
4. Disconnect harness from pump to separate pump from cover. Inspect filter screen for
debris. Screen may be pried out of pump and cleaned as required.
5. Inspect seal above fuel pump for cuts or abraisions. Replace seal if necessary. Apply
2-4-C w/Teflon to seal lips.
a -
b -
6. Loosen screw securing float assembly and remove float. Inspect float for deterioration
or fuel retention. Replace float as required.
7. Remove gasket and inspect imbedded neoprene sealing bead on both sides of gasket
for cuts or abraisions. Replace gasket/seal assembly as required.
a
b
a -
b -
c -
d -
Vapor Separator Reassembly
NOTE: Inspect VST cover gasket with sealing bead for cuts or abrasions. Replace if nec-
essary. Inspect fuel pump seal in VST cover for cuts or abrasions. Replace if necessary.
1. Install gasket w/sealing bead onto vapor separator cover.
2. Secure float, needle and pivot pin assembly to separator cover with screw. Torque
screw to 10 lb. in. (1.0 Nm)
Page 3B-50
b
c
Filter Screen
Harness Connector
58787
Screw
Float
Gasket
Sealing bead
d
a
c -
Pump
d -
Seal (Seal shoulder
faces OUT)
c
d
58786
58783
90-883728 JULY 2001
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Troubleshooting
Need help?
Do you have a question about the 150 EFI and is the answer not in the manual?
Questions and answers
I have a 1998 mercury 150 efi replaced the fuel pump stated up then I put water to it it wanted to die
Your 1998 Mercury 150 EFI engine may want to die after replacing the fuel pump due to one or more of the following reasons:
1. Faulty Fuel Pressure Regulator: Even though many assume it doesn't fail, a bad regulator can cause incorrect fuel pressure, leading to poor engine performance or stalling.
2. High-Pressure Fuel Pump Issues: If the high-pressure pump has had water in it or sat dry, it can go bad, even if recently replaced.
3. Electrical Problems: Issues like a melted fuse holder can drop power to the ECU, affecting engine performance or causing it to shut off.
4. Overcharging Voltage: If voltage at wide-open throttle (WOT) is too high, it can cause the ECU to shut off or act erratically.
5. Fuel Quality or Treatment: Contaminated fuel or improper treatment can also affect engine performance.
Each of these should be checked to identify the root cause.
This answer is automatically generated