Injection engines

How To Check Fuel Pump Injection Timing

Sheetal B
By Sheetal B. Updated: March 6, 2022
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. They are used in tractors, marine engineering and road vehicles.

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. oneHOWTO shows you this by explaining how to check fuel pump injection timing.

You may also be interested in: Why Does My Car Lose Power?
  1. How is the fuel pump injection controlled?
  2. How to set diesel injection pump timing
  3. What are the Symptoms of Engine Pump Timing Problems?

How is the fuel pump injection 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. Diesel fuel injection pump timing issues are more common in older engines and might be more commonly experienced by owners of old roadsters, tractors or similar engines.

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.

How To Check Fuel Pump Injection Timing - How is the fuel pump injection controlled?

How to set diesel injection pump timing

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. The extent of the problem will also depend on how far off is the timing, i.e. if the timing is only slightly off, there may be minimal or not symptoms.

There are also similar diesel engine problems which can lead to similar issues. If the fuel line is dirty, for example, then smoke might billow from the exhaust. This is why it is often important to go to a mechanic as our own diagnostic tests may not be sufficient.

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

If you want to read similar articles to How To Check Fuel Pump Injection Timing, we recommend you visit our Car Maintenance and Repair category.

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Setjhekela amos
I HV 2l engine diesel I have done the timing the problem is is not starting nd maybe ma I have to blued the injections of I should start is pushing diesel into injectors maybe I should bleed it
I wanted to know how to adjust timing when it's high cino truck howo?
how do you set the injector pump timing for the 6d14 engine
How to set diesel high pressure
Bill Dalton
I have a 2004 Renault Laguna 1.9dci, the cam belt snapped and it bent the valves. I have replaced the complete head but cannot find any timing marks on the pump pulley but have the other two pins in place, can you tell me how to time up the injection pump.
Regards Bill Dalton
micheal kebede
i have car model eicher 10.80 i want how to injection timing gera
ryou see fornts engine. puli 4.0 tinming marks
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
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.
Good day I had a problem with my BMW e90 320d 2010 I have replace a diesel pup from 2008 Bmw from there wen I exelarate the is a smoke so it is possible to do adjustment please help I don t enjoy my car anymore
This article describes some ancient tech type of engines, not electronically controlled inj or "common rail" engines. Consult your mechanic.
They are some marks on the gear that hold the pump and marks on main gear does these marks link??
tony Lancelot
how can I time an engine Wch d timing point is not indicated in d engine?
Make sure that ur cylinder piston no 1 has in position TDC beginning of intake end of exhaust it is the perfect timing u have to do..before replace the injection which is in no.1 firing also
How to setting PC300 FIP timing. engine and pump how to timeing
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How To Check Fuel Pump Injection Timing