[jramprakash]

Dear Brothers,

A Query: whats the running time of a Fuel Pump of a Maruti 800?? An approximate answer.

Can anyone explain me why it is used ??

Regards
Ram

[anujmishra]

A fuel pump is used to bring petrol from petrol tank in the rear to the carb or injectors. It also regulate petrol supply.

There is no definite/fixed life for fuel pumps, it can last as long as your car last but it is a mechanical part so get wear and tear upon use and chances are it may give up at certain point.

[Sankar]

The fuel pump in my old 800 went bust in around 45000 kilometers. I have heard this is usually the case with old 800s with mechanical pumps.

It doesn't cost much so might as well change it if it's old.

[noidaboy]

Mine managed to survive 58000kms/13yrs,its costs around 650 or so

[harry2223]

my car fuel pump is working till now . 11 years old and car driven 85000 kms

[dkamath]

Originally Posted by jramprakash

Can anyone explain me why it is used ??

My attempt at answering this question
Due to the fuel feed system (carburettor/injectors) being at a higher plane than the fuel tank, a fuel pump is used since the fuel cannot be delivered to the feed system by natural gravity (like in 2 wheelers, where the tank is positioned higher than the engine). Please correct me if i'm wrong.

[rider60]

mine lasted 8 years and 87000kms i am guessing its due to adultrated fuels that these pumps go kaput, well i had to drive the car with a wet cloth on the pump(so that its not over heated and stops working) so that it takes me to the garage, paid some 600 odd bucks to have it replaced with a MGP one.

[directinjection]

The fuel pump in my 800 lasted 11 years and 2,10,000+ KMs!

[aaggoswami]

Our Maruti 800 is November 1992 model. Has done more that 80K kms. No fuel pump relacement required. It wil cost around 700-750 rs. approx.

[reveal_da_zeal]

Mine has done almost 75k, 2000 model and i neva knew there is any such pump in this car... Thanx to all that now i know and thanx to M-800 that i never knew it has to be replaced when it gets worn off...

[SirAlec]

Maruti 800 fuel pump
(this is the original suzuki one, one we have looks bit flatter.)

[amitk26]

Bumping an old thread , a strange problem is observed in Maruti 800 carb model.
After running some 25 Km it starts stuttering and stops before stopping it does not revv fully .
Leave it for 15 mts and it works again.

Got the carburettor cleaning done but problem persists.

Is it faulty fuel pump ? How much does it cost these days ?

[CrackedHead]

Originally Posted by amitk26

Bumping an old thread , a strange problem is observed in Maruti 800 carb model.
After running some 25 Km it starts stuttering and stops before stopping it does not revv fully .
Leave it for 15 mts and it works again.

Got the carburettor cleaning done but problem persists.

Is it faulty fuel pump ? How much does it cost these days ?

Had the same issue with my carb 800 a couple of years ago. Mechanics at RNS motors hosur road had a field day charging me for unnecessary carburetor overhauls when it was just a failing fuel pump.

The part is not expensive - please have it replaced.

[saket77]

Originally Posted by jramprakash

Dear Brothers,

A Query: whats the running time of a Fuel Pump of a Maruti 800?? An approximate answer.

Can anyone explain me why it is used ??

Regards
Ram

I believe you are talking of old mechanical pumps.

These pumps can fail prematurely if car is made to drink even the last drops of fuel frequently & hence resulting in a dry pump. Also, older pumps (called the AC Mechanical Fuel Pump) tend to depreciate faster when cars are left idle for many days. Hot weather takes its toll too, hence many people tie a bunch of jute on the pump and keep it hydrated with water to run the pump cool. As so many factors affect pump life, its difficult to pin-point the exact life span but the good thing is that they are not expensive, esp. when compared to electronic ones. These pumps have generally shorter lives as compared to electronic pumps that most modern MPFI cars have.

The electronic pumps generate much higher pressure than the mechanical ones and hence need to be kept cool. For this purpose, they are generally planted inside the fuel tank. & contrary to general common sense, that electric fuel pumps in tank would be risky in case of spark, etc. but the fact is that they are safer placed there only!

Regards,
Saket

[fighterace]

Reviving an old thread.

Originally Posted by amitk26

Bumping an old thread , a strange problem is observed in Maruti 800 carb model.
After running some 25 Km it starts stuttering and stops before stopping it does not revv fully .
Leave it for 15 mts and it works again.

Got the carburettor cleaning done but problem persists.

Is it faulty fuel pump ? How much does it cost these days ?

I recently got mine replaced for about rupees 370. It's a UCAL unit. The TVS ones cost about the same. How much did yours cost? Which one did you get?

Originally Posted by SirAlec

Maruti 800 fuel pump
(this is the original suzuki one, one we have looks bit flatter.)
Attachment 24475

I am proceeding on a (pleasurably needless) exercise of repairing the old fuel pump. It is a TVS unit which came with the car and lasted for 78000 odd kilometres. I have managed to get a KPACCO rebuild kit, the pictures of which I am posting. It is supposed to work for the Mikuni pumps, will it work for the TVS ones as well?

Also, the rubber of the diaphragm of the old pump has raised lump at the top around the metal part, whereas the replacement one is flat (refer to the first picture, in the original the rubber is raised in a ring which fits the upper part perfectly, while the bottom is flat). Is that due difference in design or a result of usage?

I was also unable to open the middle unit containing the check valves. The existing ones look alright. Any suggestions?

Comments on the quality of the rebuild kit is also welcome.

The reason for the replacement was that my mechanic said that it was leaking petrol into the engine from the rocker arm. This he checked by holding a match at the mouth of the rubber pipe that goes into the air cleaner (the match burned faster), and smelling the dipstick. Any comments on that?