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Location:
northern beaches
Registered:
August 2002
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sprinter fuel?
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Wed, 16 October 2002 10:22
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ive just brought a sprinter and im not sure if its suposed to take leaded or unleaded fuel, i asume its leaded because of the age? its just the standard 4ac motor. is the 4age leaded or unleaded?
also when i turn the igniton to 'on' there is a knocking sound in the rear, is this an electric fuel pump? i was under the impresion that sprinters had a mechanical fuel pump driven of the crank?
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Location:
MELBOURNE
Registered:
May 2002
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Re: sprinter fuel?
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Wed, 16 October 2002 10:45
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4a-c is leaded and the 4a-ge's are unleaded. Sounds like your exhaust is knocking on something. The fuel pump is mechanical on the 4a-c
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Location:
northern beaches
Registered:
August 2002
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Re: sprinter fuel?
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Wed, 16 October 2002 11:22
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the knocking noise is when the engine is not running, just when the ignition is "on"
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I supported Toymods
Location:
Sydney
Registered:
May 2002
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Re: sprinter fuel?
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Wed, 16 October 2002 14:24
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the 4AC was Leaded?
but i had an unleaded sticker.. and only fed her that.. hmm?
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Location:
Adelaide
Registered:
July 2002
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Re: sprinter fuel?
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Wed, 16 October 2002 19:22
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The 4ac's in sprinters are leaded, most if not all 4acs built before 1986 are leaded. After that they added all this anti pollution crap cat converters and the like and they made them run unleaded.
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Location:
Adelaide
Registered:
July 2002
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Re: sprinter fuel?
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Wed, 16 October 2002 19:24
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As for the knocking, i can't think of anything electrically operated that would cause that sound in the rear of a 4ac powered sprinter, the 4acs are mechanical fuel pump
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Registered:
July 2002
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Re: sprinter fuel?
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Wed, 16 October 2002 19:57
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the 4ac are leaded as you can tell by the fuel filler neck, but it's one of those engines that you can run unleaded without any problems, but timing needs to be adjusted, most likely it's already been adjusted to run unleaded..
how does the "knocking" sound sounds like? If it's a "buzzing" noise, then it's a fuel pump, 4ac uses mechanical fuel pump, but there's nothing stopping you from installing an electric fuel pump right?
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Location:
northern beaches
Registered:
August 2002
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Re: sprinter fuel?
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Thu, 17 October 2002 08:07
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its like a tap tap tap, my mate has a dato 1200 ute with a ca18 in it with a electric fuel pump and it sounds just like that just a bit quieter.
last night i found a wire that comes from the rear of the car near the tank to the front. it has an inline fuse, so i took the fuse out and turned the ignition on and the knocking wasnt there. i started the car and after about a minute or to it died (through lack of fuel i suspect)i put the fuse back in and started it and it ran fine. so i supose this means someone has fitted an electric pump?
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Location:
Adelaide
Registered:
July 2002
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Re: sprinter fuel?
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Thu, 17 October 2002 14:22
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i looked at doin the conversion to a efi fuel tank and internal pump on my 4ac just to save me doing it later when i install the 20v, but i decided against it as the fuel pump puts outabout 40 or 50 psi pressure and the carby is designed for like 6 or 7 psi so i would have to install a fuel pressure regulator to keep it all working...was a waste of time and money to do it so if someone has done it i don't know why they would... no real gains to be had. i'd say check the fuel line from the carby and see if it goes into a round thing with tow other hoses coming off it. that should be the mechanical fuel pump. and yeh the fuel pumps i've heard make a humming or buzzing sound
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Registered:
July 2002
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Re: sprinter fuel?
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Thu, 17 October 2002 14:32
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if you've heard your friend's fuel pump making the same tapping noise, and if after removing the fuse, your car dies within minutes of starting up, one can only assume it's the fuel pump, or should I say, it HAS to be the fuel pump, coz it can't be anything else right?
But I assume it'd be fairly dangerous to have an electric fuel pump connected this way without an ECU of some sort, as the fuel pump would still be on after an accident etc. even when the engine isn't running!
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Location:
Adelaide
Registered:
July 2002
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Re: sprinter fuel?
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Thu, 17 October 2002 14:52
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Yeh that reminds me that was the other problem, i owuld have had to have a kill switch for the pump...though if i were knocked out it would still be useless.....one way to test for sure i guess is to take the fuel line off the carby stick it in a jar or something similar and turn the ignition to on if petty comes out then there a electric pump pumping it 
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Location:
Yowie Bay, Sydney
Registered:
June 2002
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Re: sprinter fuel?
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Fri, 18 October 2002 07:52
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mate its an electric diaphragm pump (not a motor or efi pump)
they're designed to replace the mechanical pump
i fitted one to the outside of my tank and use it to fill my surge tank which is under the bonnet
and yes it makes a tapping noise, mazda sold one in their cars that was quiet though, they're about $110 if it annoys u that much
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Location:
northern beaches
Registered:
August 2002
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Re: sprinter fuel?
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Fri, 18 October 2002 08:40
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the pump running after the car had stalled or watever was my main concern! ill have a look for the mechanical pump tomorow, and i might even pull the fuel line off.
thanks guys
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Location:
northern beaches
Registered:
August 2002
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Re: sprinter fuel?
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Sun, 20 October 2002 03:35
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ok so when i upgrade to 4age i can use this pump to fill the surge tank and then run a high pressure pump from there?
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Location:
cambo
Registered:
May 2002
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Re: sprinter fuel?
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Sun, 20 October 2002 11:46
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what must be done to the timing to run the 4ac on unleaded? first night i got my sprinter i ran it on unleaded by accident of habbit, and have run it on leaded since then. i suppose the timing has to be retarded a couple of degrees?
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Location:
Montrose, VIC
Registered:
May 2002
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Re: sprinter fuel?
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Sun, 20 October 2002 14:01
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You could probably run a 4AC on paint thinner  or any other leftover kitchen substances? 
(hang on, is that suggesting I cook with thinners?)
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Registered:
July 2002
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Re: sprinter fuel?
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Sun, 20 October 2002 15:41
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I don't see any problem using your electric fuel pump with your surge tank..
EVOSTi, I think you'll have to ask your mechanic or search the web for the answer, but I assume your engine has already been adjusted for unleaded, try running the car with unleaded and if you don't have major power problem, or pinging problem, then it should mean that it's already been adjusted.. (but leaded fuel will run with more power compared to unleaded fuel, also the lead additive is also an anti-pinging additive, sort of an octane booster to a certain point, but the extra cost associated aren't worth it I reckon)
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Location:
cambo
Registered:
May 2002
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Re: sprinter fuel?
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Mon, 21 October 2002 06:57
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yeahs tuff it ill run it on unleaded. if the motor blows ill just have to chuck the GZE in sooner... without the brake conversion i am saving up for first 
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Location:
Yowie Bay, Sydney
Registered:
June 2002
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Re: sprinter fuel?
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Mon, 21 October 2002 07:03
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i ran my old 4a-c only ever on optimax, got an extra 80-100k out of a tank of fuel, never had any problem and i drove it in a way that it should have shit itself instantly but it just wouldnt die!! drove it damn hard for a bit over a year on unleaded
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