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Technical is my fuel pump knackered?

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Technical is my fuel pump knackered?

dave

dave

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stole a battery off daryl today an put it on the 4x4, but petrol wouldnt come up. if i sucked on pipe i got a mouth full but it wouldnt come up turning it over, is my pump gone or do i need to put more than half a gallon of petrol in?

ive bought another gallon tonight, but thought i would start the thread any way :eek:

oh its the manual type pump :)
 
Sounds like pump is US'ed. Think we've same problem with our 750L (none donor). Has half a tank and will turn but not fire. Keep meaning to get around to checking if there is a spark or any fuel, but think there is no fuel getting through as normally if no spark the engine will smell of fuel when it gets flooded.

If you've any fuel line spare, attach it to the fuel in side of the pump, and then put the other end of the pipe directly into a gerry can of fuel and see if it will start.

Jon.
 
dave said:
stole a battery off daryl today an put it on the 4x4, but petrol wouldnt come up. if i sucked on pipe i got a mouth full but it wouldnt come up turning it over, is my pump gone or do i need to put more than half a gallon of petrol in?

ive bought another gallon tonight, but thought i would start the thread any way :eek:

oh its the manual type pump :)
Click to expand...
if you can suck it up, the fuel pump should be able to:(
.........hang on....sarcasm ..must resist.....no good
if it's a 'manual' pump are you forgetting to crank the handle or something?:chin:

sorry, not helping there. assume you meant mechanical pump. I seem to remember Nitro warrior having similar problems and the pump had seized and eaten his camshaft so a replacement pump still didn't work. Worth checking if you do end up changing it.
https://www.fiatforum.com/panda-classic/165471-running-problem-5.html?p=1815639
 
yeah mechanical pump, i hope its not done cam in 4x4 cams are rare :( it was sitting dry for a year or so, so maybe a diaphram dried out n split? a man has pmed me an said he going to look in his garage for a pump for me :)

may be i gotta prime it up some how? years ago pumps used to have a lever on an if you ran out of fuel you had to pump by hand for a bit
 
Last edited:
CLXCraig said:
Correct me if i'm wrong, but i was of the understanding that 4x4 cams were the same as the cams from the 1108cc enigines.. comonly found in puntos and cinq/seis.. if they are, allanhelen has one for sale(y) bit OT sorry
Click to expand...

ah i have one of them, some one told me 4x4 cams was special once. does the 1108 cam still have a lug to make pump work?
 
Take the petrol cap off the tank and see if the
pump pumps then too. Had a locking cap on at the time
and the fine air vent was blocked and no way
was it going anywhere as it was.

John
 
Put a drop a table spoon and no more of petrol down the neck of the carb should start the engine. The cam on the 1100 ie panda auto is electric so hole is blanked off. Another test take off pipe that feeds petrol into carb at carb end turn engine over so if she throws some petrol out? if she none then you have found the fault I assume the cam belt is still ok?
 
:worship:Correction to my comment the fuel supply is via elec. pump in petrol tank and is fed into engine via SPI so the fixing point for the mechanical petrol pump is blocked off with a blanking plate
 
CLXCraig said:
Correct me if i'm wrong, but i was of the understanding that 4x4 cams were the same as the cams from the 1108cc enigines.. comonly found in puntos and cinq/seis.. if they are, allanhelen has one for sale(y) bit OT sorry
Click to expand...

Sorry :eek:, bu you are wrong. The 4x4 cam was, however, fitted to some 1242punto 60 engines.
 
I never got to the bottom of why mine wasn't self priming. To be honest I don't think they self prime very well, many cars with similar mechanical pumps have a manual pump to get things going.

If the pump's not completely broken(/cam worn) you can get it running by gravity feeding fuel into the pump. Just disconnect the fuel line going into the pump where it attaches to the plastic pipe as it emerges from the bulkhead coming from the tank. Jam a funnel into the end of the pipe and pour fuel into it. Helps to have someone to turn the key whilst you hold the fuel pipe and keep the line topped with fuel. (you can do it on your own if you clamp the fuel hose verticaly so it deosn't spill).

If the engine starts great, reattach the fuel line and start it again. You'll have enough fuel between the pump and the carb to run the engine for a wee while. Now you have draw from the engine it should suck fuel up the lines and you should be ok.

My problem is I have an air leak somewhere or a broken return valve, so the fuel drains back to the tank and the pump won't then self prime. I bodged it by fitting a fuel pump bulb which doubles as a non return valve to stop the fuel draining back.

The other thing I should say is pumping the throttle helps. 20 to 30 rapid pumps of the accelerator before turning the key.
 
Last edited:
nitro_warrior said:
The other thing I should say is pumping the throttle helps. 20 to 30 rapid pumps of the accelerator before turning the key.
Click to expand...

Nooooo! :eek:

First of all, if the fuel pump doesn't work and the float bowl is empty of fuel then pumping the throttle will do nothing. If the float bowl has fuel in it then pumping the throttle will activate the accelerator pump diaphragm, which in turn squirts a measure of fuel straight into the carburettor venturi. Pumping this 20 - 30 times will flood the engine, though unless the engine is running pumping that many times will soon empty out the fuel in the float bowl. You'll still risk flooding the engine though!

Pumping the throttle a couple of times, pulling out the choke and then starting the car should always get the engine running (y) (Obviously this applies to carburettor equipped cars. SPi throttle bodies work on different principles.)

Amazingly in all the miles I've done in FIRE engined equipped Fiats I've never had a fuel pump fail but maybe I've been lucky. *Furiously touches wood after say this!*

I wonder what will turn out to be the problem with Dave's 4x4? I think everything has already been covered, but the simple test is to removed the pipe from fuel pump to carburettor, put the end into a jar and get someone to turn the engine over. Fuel should come out of the pipe in pulses, if it doesn't then the problem lies somewhere between the fuel pump and the fuel tank.

Hope you get it sorted Dave (y)
 
went and picked pump up off member, but when i got home and went to fit it i found problem, it was that pin but it was stuck out not in luckly, i pulled it out oiled it put it back an my original pump at it working :slayer: got a leaking pipe to replace though between pump n carb, i got one of them. then take pump back an see if he got new throttle cable an choke cable cox they both buggered
 
dave said:
went and picked pump up off member, but when i got home and went to fit it i found problem, it was that pin but it was stuck out not in luckly, i pulled it out oiled it put it back an my original pump at it working :slayer: got a leaking pipe to replace though between pump n carb, i got one of them. then take pump back an see if he got new throttle cable an choke cable cox they both buggered
Click to expand...

How come it got jammed? Was it just sticky with old oil? Hope the rest of the head isn't that gunged up!

Good news it's working now though (y)
 
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