Fuel starvation issues Electric and mechanical pump
Posted: 23 Jul 2014, 11:26
Hi 8090, I'm a bit stumped and really need some friendly advice before i start to cry!
I have 1986 1.9DG transporter that I have been converting into a camper for some time. I have had it on the road for some time and a few months ago the fuel stopped getting into the carb and I broke down, did some fiddling and got it back some how just before the RAC man arrived and he suggested that it might be the fuel pump. so I replaced the mechanical fuel pump and all seemed fine until it did the same thing again. hummm. Then tried a new an electric fuel pump and it seemed to struggle getting up to pressure. I then looked on the various forums and suggested that it could be a blocked fuel tank or line and as I want to replace the tank as I could smell fuel if I over filled the tank thought this might be a good idea.
So replaced the fuel tank and the pipes but not the hard line, as well as float valve and seals.
After all this I then thought I would just try the old Mechanical pump and see if that would work which it did for a day but then the Engine started to race fast and faster as it got hot. I then let it cool down when I got home and when it started again it stopped pumping fuel. So switched back to using the new electric fuel pump with regulator but its really struggling to get enough fuel pressure. I have no pressure measuring device but have a clear fuel filter before the it goes into carb and its trickling through rather than filling up which doesn't seem right.
the only thing I haven’t replaced is anything to do with the carb, except had previously replaced the choke pull down unit, and not changed anything on the return side to the tank, including the none return valve. Could this be the issue?
what could be causing low pressure from the pump. got to be a blockage?? I have some pressure when idle but not under load, get about ten yards down the road and it conks out until it gets fuel back in the carb.
Could fuel pipe size be causing an issue, I'm coming of the 8mm connections form the pump up the original hard lines which don't appear to be blocked?
Im using this electric pump,
http://www.carbuildersolutions.com/uk/e ... ump-silver" onclick="window.open(this.href);return false;
connected directly to the battery with a relay connected to the ignition coil and i'm getting 12V when idle.
I have a fuel regulator inline which is recommended with electric pumps it does seem to effect the pressure but only a tiny trickle. I'm going to take off the regulator to see what that does just to eliminate from the equation.
So just to be clear I have
Fuel tank connected to Fuel pump next to tank, then up the hard line to a regulator then to a fuel filter then out to the carb.
Could there be a problem with the carb that is causing these issues?
The Tank is new could I have an issue with some of the lines to the expansion tank which would cause a pressure a leek(clutching at straws here people)
Sorry for my dyslexic ramble hope someone can decode my many issues. Any ideas or things to try would be appreciated.
cheers
I have 1986 1.9DG transporter that I have been converting into a camper for some time. I have had it on the road for some time and a few months ago the fuel stopped getting into the carb and I broke down, did some fiddling and got it back some how just before the RAC man arrived and he suggested that it might be the fuel pump. so I replaced the mechanical fuel pump and all seemed fine until it did the same thing again. hummm. Then tried a new an electric fuel pump and it seemed to struggle getting up to pressure. I then looked on the various forums and suggested that it could be a blocked fuel tank or line and as I want to replace the tank as I could smell fuel if I over filled the tank thought this might be a good idea.
So replaced the fuel tank and the pipes but not the hard line, as well as float valve and seals.
After all this I then thought I would just try the old Mechanical pump and see if that would work which it did for a day but then the Engine started to race fast and faster as it got hot. I then let it cool down when I got home and when it started again it stopped pumping fuel. So switched back to using the new electric fuel pump with regulator but its really struggling to get enough fuel pressure. I have no pressure measuring device but have a clear fuel filter before the it goes into carb and its trickling through rather than filling up which doesn't seem right.
the only thing I haven’t replaced is anything to do with the carb, except had previously replaced the choke pull down unit, and not changed anything on the return side to the tank, including the none return valve. Could this be the issue?
what could be causing low pressure from the pump. got to be a blockage?? I have some pressure when idle but not under load, get about ten yards down the road and it conks out until it gets fuel back in the carb.
Could fuel pipe size be causing an issue, I'm coming of the 8mm connections form the pump up the original hard lines which don't appear to be blocked?
Im using this electric pump,
http://www.carbuildersolutions.com/uk/e ... ump-silver" onclick="window.open(this.href);return false;
connected directly to the battery with a relay connected to the ignition coil and i'm getting 12V when idle.
I have a fuel regulator inline which is recommended with electric pumps it does seem to effect the pressure but only a tiny trickle. I'm going to take off the regulator to see what that does just to eliminate from the equation.
So just to be clear I have
Fuel tank connected to Fuel pump next to tank, then up the hard line to a regulator then to a fuel filter then out to the carb.
Could there be a problem with the carb that is causing these issues?
The Tank is new could I have an issue with some of the lines to the expansion tank which would cause a pressure a leek(clutching at straws here people)
Sorry for my dyslexic ramble hope someone can decode my many issues. Any ideas or things to try would be appreciated.
cheers