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How To Check Fuel Pump Injection Timing

How To Check Fuel Pump Injection Timing

A fuel injection pump is an important component of engines that operate on diesel fuel. A fuel injection pump is the part responsible for pumping fuel to the cylinders, that in turn determine the power that can be generated by the engine.

So why is a fuel injection pump and its timing important? The right amount of fuel and its timing are extremely critical because it regulates the combustion of fuel and the speed of the engine. Therefore, maintaining precise timing is important every time the timing belt of an engine has been replaced or adjusted.

You may also be interested in: How to Stop White Smoke from the Exhaust

How is Fuel Pump Injection Timing Controlled?

If you decide to do this yourself, it makes sense to first go through the user manual for the engine you are working on in some detail. If you have a newer diesel engine, its quite likely that the fuel injection system will be electronically controlled, so you will need to take it to an approved dealer to have the work carried out.

If it is an older diesel engine with a mechanical fuel injection pump, you will need to check for the type of crankshafts, pipes, cylinders, gears etc of your model. You should check before starting the work, as making adjustments to a fuel injection pump could present warranty voiding issues.

In order to ensure the timing is correct on a mechanical fuel injection pump, first rotate the engine to the top dead center (TDC) and engage the TDC timing pin with the camshaft gear. Then remove the timing pin access plug from the injection pump and verify if the slot in the pin will fit over the timing tooth of the pump.

Next, carefully replace the pump to correct the timing, adjusting and readjusting the timing pin and access plug in the injection pump. Lastly, disengage the timing pin from the camshaft gear. You may want to read more about when to replace your timing belt for more information.

What are the Symptoms of Engine Pump Timing Problems?

Incorrect fuel injection pump timing leads to reduced performance of the engine and can cause engine misfiring or other less obvious symptoms. It also causes over-consumption of fuel, excessive smoke production, loss of power and problems starting the engine as well.

So next time you feel your car is not running smoothly, misfiring or giving out excessive smoke, the fuel injection pump timing could be the culprit, so take it to your mechanic to get the problem diagnosed.

If you'd like to read similar articles to How To Check Fuel Pump Injection Timing, we recommend you browse around our Car Maintenance and Repair category.

Comments (14)

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Santhosh Furtado
PS8500 fuel injection pump , Model CB-BHM6P120YAY170 this pump is for 6 cylinder HOWO Engine,
I missed the pump timing.How to fix the timing of FI pump?
Engine is set for TDC for No 1 Cylinder
gaza jo
Hi help me what problem....
my car it continues to running after switch off key and to accelerate without apply paddle?
also exhaust white smoke?
Bir Narayan Maharjan
Hi sir I need a Iveco Engine models 8210 how many Degrees BTDC fixed Fuel Injection Pump
Lesang Maitiyo
I dont have any coment or quaestion.i'm very happy for you education and i bag for more since i don't have fees for scolarship
OneHowTo Editor (OneHowto editor)
We're glad this article was useful for you
Munesh Kumar
How To Check Fuel Pump Injection Timing
Please tell me timing
how to check fuel pump timing 1300 serial
Hi, its two stroke or four stroke?
by please, makes 2 months that have the vehicle arrested because not can get them data of put punto of your engine, OM XXX-XXX-XXX year 1993 M.Benz 290 GD (W461) box manual, if not is possible get them data them would appreciate any information to the respect. Best regards Mario
I forgot to add that some of those symptoms can be caused as well by falty turbocharger...
Actually the article mentioned symtoms which can be caused by many other things like wear on the rings, liner, piston - poor comression, burning of lube oil and excessive blueish smoke ; misfiring - faulty inj valve - seizing or leaking, ; dirty fuel filter - loss of power; problems with starting - poor compression, faulty heating plugs. The article isn't mentioning that some engines have inj timing advance unit of which a fault is more probable than the problem with misalignment of timing gears. Not helpful at all. What the hell means "running smoothly"? I hope it is not an engineering term. Usually if You have problem with inj timing on diesel engine You will have problems like whitish smoke "solid" like and not dissipating so easily - evaporated and not burnt completely fuel or too high exhaust gases temperatures.

How To Check Fuel Pump Injection Timing
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How To Check Fuel Pump Injection Timing