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1989 r600 constant surging when you step on throttle idles…

Customer Question
1989 r600 constant surging...

1989 r600 constant surging when you step on throttle idles fine

Mechanic's Assistant: What's the make/model/year of your truck? Engine type?

1989 r600 w/ 300 mechanical injector pump em6300l

Mechanic's Assistant: Are you fixing your truck yourself? What have you tried so far?

Replaced linkage

Mechanic's Assistant: Anything else you want the truck mechanic to know before I connect you?

Has new motor

Submitted: 10 months ago.Category: Medium and Heavy Trucks
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Answered in 13 hours by:
10/6/2017
Technician: Curtis B., Technician replied 10 months ago
Curtis B.
Curtis B., Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 31,849
Experience: Technician turned service manager on multiple lines of trucks and engines, used in industry.
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Welcome to JUST ANSWER heavy equipment. With years of experience, I look forward to doing my best to help.

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Technician: Curtis B., Technician replied 10 months ago

Surging can be sign of not enough fuel to the injection pump from the tank. Make a test line and attach it at the fuel transfer/primer pump inlet, and drop into a fuel container or back into the fuel tank filler opening and run test with the tank and hoses up to the primer pump bypassed. If it no longer surges, start checking the suction system. Best bet is the first fitting, where the hose from the tank goes to the fuel strainer. This is where any debris too big to go into the strainer will collect.

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