85Santana3

Active Member
I have suffered from overheating fuel pump ever since I bought this truck and in fact I even installed a back up electrical fuel pump to switch between the two. Despite these every summer dealing with heat was a pain in the neck. Finally after a day of having to switch back and forth 5 times I came up with an idea which has worked so far. Idiotic as it may seem it might help others who have the same problem. So I share it:
First I changed the place of hose where fuel is sent to carburator. I tried to pass it through a cooler area insted of going right on top of engine which would be very hot. Then I found galvanized metal ducts (actually low teck chimney for fire place or oven) with two corresponding 90 degree elbows and put them together in manner shown in photos bellow. It is installed in a way that colder air from the bottom of the truck (when it moves) is pushed up to the fuel pump which has a sock full of wet sand sitting on top of it. A plastic water container with a robber hose is supplying water to the sand in the sock when I press its sides. This is done before I start a journey or if it is too hot once or twice during the day.
Finally I placed a bit of aluminum foil between the engine and fuel pump (till I find better insulation material).
It looks ridicuouls but since I have added this I had no vapour locking problem.
I welcome any suggestion for imporving my hillbilly solution (what is the equivalent of hillbilly in uk?)
regards
 

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I have suffered from overheating fuel pump ever since I bought this truck and in fact I even installed a back up electrical fuel pump to switch between the two. Despite these every summer dealing with heat was a pain in the neck. Finally after a day of having to switch back and forth 5 times I came up with an idea which has worked so far. Idiotic as it may seem it might help others who have the same problem. So I share it:
First I changed the place of hose where fuel is sent to carburator. I tried to pass it through a cooler area insted of going right on top of engine which would be very hot. Then I found galvanized metal ducts (actually low teck chimney for fire place or oven) with two corresponding 90 degree elbows and put them together in manner shown in photos bellow. It is installed in a way that colder air from the bottom of the truck (when it moves) is pushed up to the fuel pump which has a sock full of wet sand sitting on top of it. A plastic water container with a robber hose is supplying water to the sand in the sock when I press its sides. This is done before I start a journey or if it is too hot once or twice during the day.
Finally I placed a bit of aluminum foil between the engine and fuel pump (till I find better insulation material).
It looks ridicuouls but since I have added this I had no vapour locking problem.
I welcome any suggestion for imporving my hillbilly solution (what is the equivalent of hillbilly in uk?)
regards

Nice, marine thermal foil-backed insulation is cheaper than auto stuff ...

Yeah, we understand the hillbilly = Heath Robinson engineering concept ...
 
That looks simple enough but a coat of green paint would be an improvement.
Heath Robinson would be proud!
What kind of ambient temps cause you a problem
 
I had to search to see who Heath Robinson was and it was a shocking discovery. Professor Branestawn's adentures have always been among my favourite books. Good lord this explains a lot!
Steve anything above 32 C.
 
Phew That’s a bit warm
I don’t know if this will work any better than you 90 elbow! , keeping to true HR style maybe wrap the tank in a couple of those cheapie supermarket freezer shopping bags. If the tank is fullish with colder nights the insulation will help prevent it warming up during day.
 

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The standard petrol pipe fixing goes from the lift pump forward to the front of the engine passing through a pipe holder by the thermostat housing then back to the carb.
 
I would try removing that fuel filter from near the pump and relocate it near to the carb.
Col I have 2 filters the other one is before carb as you suggestd.

keeping to true HR style maybe wrap the tank in a couple of those cheapie supermarket freezer shopping bags
I think the vapour lock happens in the pump and in the hose between pump and carburator. I am going to test wrapping those in fiberglass insulation and see what differnce it makes. I am not sure what "the
cheapie supermarket freezer shopping bags" are. Here supermarkets are forcing everybody to use fabric bags (you have to buy them of course if you want to see unicorns roaming in your backyard).
At any rate I can't belive people used these Landies in Africa in that heat.

The standard petrol pipe fixing goes from the lift pump forward to the front of the engine passing through a pipe holder by the thermostat housing then back to the carb.
That's an idea maybe if I move the hose entirely problem will be solved.
 
Col I have 2 filters the other one is before carb as you suggestd.


I think the vapour lock happens in the pump and in the hose between pump and carburator. I am going to test wrapping those in fiberglass insulation and see what differnce it makes. I am not sure what "the
cheapie supermarket freezer shopping bags" are. Here supermarkets are forcing everybody to use fabric bags (you have to buy them of course if you want to see unicorns roaming in your backyard).
At any rate I can't belive people used these Landies in Africa in that heat.


That's an idea maybe if I move the hose entirely problem will be solved.
My thinking on your fuel filter near the pump is this; the standard pump isnt all that powerful and its tryingto push fuel up the pipe to the carb. There is limited pressure in the pipe anyway but it is now being hampered by that filter which is half full of air which is making the pressure after it lower. Having just one filter near the carb and more or less horizontal reduced the pressure needed to keep the carb supplied.

Col
 
Having just one filter near the carb and more or less horizontal reduced the pressure needed to keep the carb supplied.
I got some longer fuel hose and based on yours and tottot's comment I changed the position of fuel hose. It is as horizontal as it can be and with only 1 filter passing in front. I have to try a long drive on a really hot day to see what diffference it makes. I am hoping it does. At the very least under the hood it looks a lot more tidy than before. That's the beauty of these old trucks, even somebody with very basic tools and little knowledge (like me) can experiment. Thanks everybody.
 

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