new fuel pump devistating mpg

baggins91 · Mar 19, 2013

Hi folks,
i recently had to fit a new fuel pump to my 2003 disco. on the old one, i reckon i was getting about 30mpg however, since i've had the new one fitted my mpg has dropped to about 24-25.
is this just a case of plugging in the ECU and tweeking something or is it a problem with the new pump?
Any advice or comments would be really welcome.

Cheers

Baggins91

johnlad · Mar 19, 2013

more a case of making sure you dont have any leaks after fitting the new pump

Shifty1962 · Mar 20, 2013

johnlad said:
more a case of making sure you dont have any leaks after fitting the new pump

I agree

baggins91 · Mar 20, 2013

Thanks guys,
i have been under the back and there is no sign of any diesel, sight or smell. would it only be leaking whilst driving?
Cheers

ratty · Mar 22, 2013

baggins91 said:
Hi folks,
i recently had to fit a new fuel pump to my 2003 disco. on the old one, i reckon i was getting about 30mpg however, since i've had the new one fitted my mpg has dropped to about 24-25.
is this just a case of plugging in the ECU and tweeking something or is it a problem with the new pump?
Any advice or comments would be really welcome.

Cheers

Baggins91

are you going by how much fuel you are having to actually add or by what the fuel gauge is showing?

discochimp · Mar 22, 2013

Hi
check your FPR and the fuel delivery system in engine bay there might be a leak there due to the increase pressure from new pump

baggins91 · Mar 23, 2013

ratty said:
are you going by how much fuel you are having to actually add or by what the fuel gauge is showing?

At first i thought it was just the fuel gauge but i have done a couple of long trips now and kept a note of how much fuel i have used and the milage. and it is definitely using a lot more fuel than before.

I will check the FPR, thanks.

v8landyman · Mar 23, 2013

check you oil level and sniff the dipstick, to eliminate fuel leaking into the sump from a cracked head or dodgy injector seals.

baggins91 · Mar 25, 2013

v8landyman said:
check you oil level and sniff the dipstick, to eliminate fuel leaking into the sump from a cracked head or dodgy injector seals.

ooooo, that got me worried! but i've had a really good check, smelt the oil cold and hot, and definitely no diesel smell there, phew. Had a good check over the engine and the tank end and no diesel seems to be leaking. So back to the drawing board.

new fuel pump devistating mpg

baggins91

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johnlad

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Shifty1962

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baggins91

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ratty

I'm not special I'm limited edition

discochimp

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baggins91

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v8landyman

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baggins91

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