Fuel starvation? Not reaching RPMs under load

Vehicles powered by Nissan six-cylinder SD diesel engines.

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dyepro
Posts: 21
Joined: 7 years ago
Location: Vancouver

Fuel starvation? Not reaching RPMs under load

#1

Post by dyepro » 6 years ago

Here we go again,

I have two sd33's in the boat. While doing test runs at 2800rpm starboard engine rpms fell to 2200 and would go no higher.
Out of gear engine will rev up without issue. This condition only happens under load. Port engine rpm's fine. I replaced the fuel filters with no effect. I removed the injectors and had them rebuilt at FH injection. Now engine runs great but only goes to 2500rpm.
What next?? I'm hoping that I have a fuel restriction somewhere in the system in the tank or lines. Would it be the inj pump? otherwise the motor runs fine.
What would you do?

Thanks for any input.

Stef

dn29626
Posts: 249
Joined: 10 years ago
Location: Anderson, SC

Re: Fuel starvation? Not reaching RPMs under load

#2

Post by dn29626 » 6 years ago

Recheck the fuel filters. If they are gasoline rated (not diesel), fuel starvation is a result.
82 King Cab 2wd (nice)
82 Reg Cab (body damage)
Anderson , SC
Since Fall 2009

dyepro
Posts: 21
Joined: 7 years ago
Location: Vancouver

Re: Fuel starvation? Not reaching RPMs under load

#3

Post by dyepro » 5 years ago

Update
Reply to previous post... I have the same filtering the other motor with no issues.

I've replaced rubber fuel lines , re changed filters, cleaned the inlet pump filter screen, rebuilt lift pump, ran out of a jerry can (bypassed tank)......no change. I'm about to pull the injector pump and send it in to get checked and recalibrated, expensive.
Any ideas????

plenzen
Posts: 868
Joined: 13 years ago
Location: Cochrane Alberta Canada

Re: Fuel starvation? Not reaching RPMs under load

#4

Post by plenzen » 5 years ago

Try winding the smoke screw in 1/4 turn and see what happens then.
Go in 1/4 turn increments.

Keep track of how far you move it .

( yes, in is more out is less )
Retired Pauly
Problem with being retired is that you never get a day off.
1987 D21-J SD25 KC
KJLGD21FN

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