Bosch 040 Intank Pump Feedback?walbro Going!

[useless]

Guys I have purchased a bosch 040 intank fuel pump. I am sick to death of the problems with the walbro 341 . Spluttering acceleration, surging around corners ..The standard pump had no such problems.

What do you think of the bosch 040?

[Paul@eliteauto]

No offence but you probably didnt have it installed properly.

Both my cars run them and have no problems.

[useless]

Paul thanks for feedback. I suppose I am a bit pedantic when it comes to getting it right. First problem only was that it ran out of fuel alot faster and spluttered around 1/3 level.I found this annoying.In that instance I cut the bottom of the swirlpot so that the pickup was actually sitting on the floor of the tank. The car went well for a week then at a refill it went haywire again. Since then the problems compounded.Giving the system benefit of the doubt I removed and cleaned the tank,cleaned injector,replaced fuel filter,checked regulator,tightened exhaust,checked manifold bolts,throttle body clean ,clean map sensor,ego sensor.

In my mind is maybe this is not original walbro being sold by a reputable shop.Or that the swirlpot is essential to keep a pool of fuel inside the pot itself so that swishing of fuel in the tank wont cause fuel starvation.

The factory pump had 2 inlets.1 inlet had a fuel filter and the second actually drew fuel into the pot from the hole of the bottom of the assembly.

If the walbro pump was a replacement it should have had 2 inlets to suck fuel into the pot and then into the pump.This is why people cant go less than 1/4 tank or 1/3 tank for fear of running on empty.

The swirlpot should be able to supply adequate fuel for the pump but the pump is not designed to replace the standard one so cannot keep fuel from running out at lower fuel levels

[TornadoJudd]

I have a Walbro and have no such problems.

Firstly when you fitted your first Walbro are you sure you didnt bend or bump the fuel sender unit. If you bend the sender arm it can show less fuel on your gauge than you actually have in your tank, causing you to think you are using more fuel (just a thought). Secondly I only had one outlet line (from the pump) and one inlet line (return hose) so Im not to sure what you meen by when you say your pump had two inlets. Your pump should have an inlet at the bottom where your filter is connected to (which sucks fuel up) and an outlet on the top of the pump which deliviers fuel from the tank to your fuel rail.

Cutting a hole in your swirl pot could cause spluttering or surging when cornering with low fuel level.

Edited 06/06/07 09:47 PM by TornadoJudd

[useless]

I have a Walbro and have no such problems.

Firstly when you fitted your first Walbro are you sure you didnt bend or bump the fuel sender unit. If you bend the sender arm it can show less fuel on your gauge than you actually have in your tank, causing you to think you are using more fuel (just a thought). Secondly I only had one outlet line (from the pump) and one inlet line (return hose) so Im not to sure what you meen by when you say your pump had two inlets. Your pump should have an inlet at the bottom where your filter is connected to (which sucks fuel up) and an outlet on the top of the pump which deliviers fuel from the tank to your fuel rail.

Cutting a hole in your swirl pot could cause spluttering or surging when cornering with low fuel level.

My original pump has 2 inlets and 1 outlet at the top. The 2 inlets sit at the bottom and one outlet at the top with the standard pump.One of the 2 inlets draws fuel up via the swirl pot filter into the swirl pot.The second inlet also has a filter but sits inside the swirlpot. Therefore the first inlet siphons fuel in and creates a pool of fuel in the pot and the second draws on the pooled fuel to resist surging.

If you have no issues than you are very lucky.

Edited 07/06/07 07:41 AM by useless

[O2STOCK]

No offence but you probably didnt have it installed properly.

Both my cars run them and have no problems.

Paul is this even the case at fuel levels below 1/4 a tank at WOT ?

As it is well doucumented that the Walbro intank pumps cannot suck up the fuel if the factory swirl pot is empty (As under acceleration all the fuel is at the rear with low fuel levels).

How does your fitment of the pump eliminate this ? are there some special tricks to getting the swirl pot to remain full under WOT at low fuel levels ?

[useless]

Here are two photos of the standard fuel pump so that people can start to understand how it works. See the bottom ..2 inlets.The filter one sits in the swirlpot and the other draws fuel into the swirlpot via a hole in the bottom wi\hich has a filter also attached outside. While there is enough fuel in the tank to force adequate fuel into the swirlpot ..once low it would impossible for the walbro to suck in fuel and hence the surging.If the walbro was double inlet like the standard one then it would not have the problems

Edited 07/06/07 09:11 AM by useless

[Paul@eliteauto]

Paul is this even the case at fuel levels below 1/4 a tank at WOT ?

As it is well doucumented that the Walbro intank pumps cannot suck up the fuel if the factory swirl pot is empty (As under acceleration all the fuel is at the rear with low fuel levels).

How does your fitment of the pump eliminate this ? are there some special tricks to getting the swirl pot to remain full under WOT at low fuel levels ?

It doesnt mean you cant give a quick stab at WOT under 1/4 tank.

Just avoid more than 0-80 at WOT. I think you too hung up on the subject. Its not a huge issue.

No I would do a full on drag at the light with less than 1/4. Who cares.Fill up. that's just my opinion.

My mods on F6 are awesome and are trouble free being aware of the situation.

Start you mods and enjoy your F6!

Cheers Paul

[O2STOCK]

It doesnt mean you cant give a quick stab at WOT under 1/4 tank.

Just avoid more than 0-80 at WOT. I think you too hung up on the subject. Its not a huge issue.

No I would do a full on drag at the light with less than 1/4. Who cares.Fill up. that's just my opinion.

My mods on F6 are awesome and are trouble free being aware of the situation.

Start you mods and enjoy your F6!

Cheers Paul

If you give it a quick stab of WOT in this situation ,isnt it true to assume that your car is going to run out of fuel as the car is consuming more fuel than what is being supplied, due to the swirl pot becoming empty in the tank. Resulting in the motor leaning out if you do not get off the accelerator ?

Not a huge issue Ummm

I plan to do 1/4 mile runs and track work. Plus is a daily driver. Fuel supply is very important I think but that is just my 2c I guess, each has there own opinion.

The only solution is to fit a external surge tank until someone comes up with a solution to supply high volume fuel from with in the tank at low levels, during acceleration.

The way the STD fuel tank is configured I am of the opinion that this may not be possible with out modifying the tanks pick up points.

May be a aftermarket fuel tank

Being a daily driver I run my tank to almost empty filling the car up 2-4 times a week depending on the location of or work that week. To reduce this range to half is a big deal and one of the reasons for not modifying it ATM.

[Paul@eliteauto]

Both my cars are daily drivers and both have run down to saying Zero km range without leaving me high and dry.

Both are used as either track or drags.With confidence.

There are 2 reasonable solution.

1 drive them conservitbly under 1/4 tank. Which I personally dont see as an issue because under normal dailly driving there is no problem.

2. Nizpro HAS developed a new intank surge tank.

Any other external type systems I personally find way to noisy and anoying to be a daily driver.

If you dont mind a constant buzz out your pride and joy go the external surge tank.

Cheers Paul